This bug exists with or without desktop effects.  It is reproduceable in all 
tested versions of Java 1.6 and 1.5.
I've been fighting it since April when it appeared after installing 8.04.  I 
have found no set of conditions which keep it from showing up on this computer. 
 I have no yet tried a live cd.
This system is as follows:

$ lsb_release -rd
Description:    Ubuntu 8.04.1
Release:        8.04

$ apt-cache policy xorg
xorg:
  Installed: 1:7.3+10ubuntu10.2
  Candidate: 1:7.3+10ubuntu10.2
  Version table:
 *** 1:7.3+10ubuntu10.2 0
        500 http://mirrors.kernel.org hardy-updates/main Packages
        100 /var/lib/dpkg/status
     1:7.3+10ubuntu10 0
        500 http://mirrors.kernel.org hardy/main Packages

$ lspci
00:00.0 Host bridge: Intel Corporation 5000X Chipset Memory Controller Hub (rev 
12)
00:02.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 2 
(rev 12)
00:03.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 3 
(rev 12)
00:04.0 PCI bridge: Intel Corporation 5000X Chipset PCI Express x16 Port 4-7 
(rev 12)
00:05.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 5 
(rev 12)
00:06.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 6 
(rev 12)
00:07.0 PCI bridge: Intel Corporation 5000 Series Chipset PCI Express x4 Port 7 
(rev 12)
00:10.0 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev 
12)
00:10.1 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev 
12)
00:10.2 Host bridge: Intel Corporation 5000 Series Chipset FSB Registers (rev 
12)
00:11.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers 
(rev 12)
00:13.0 Host bridge: Intel Corporation 5000 Series Chipset Reserved Registers 
(rev 12)
00:15.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev 
12)
00:16.0 Host bridge: Intel Corporation 5000 Series Chipset FBD Registers (rev 
12)
00:1b.0 Audio device: Intel Corporation 631xESB/632xESB High Definition Audio 
Controller (rev 09)
00:1c.0 PCI bridge: Intel Corporation 631xESB/632xESB/3100 Chipset PCI Express 
Root Port 1 (rev 09)
00:1d.0 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB 
Controller #1 (rev 09)
00:1d.1 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB 
Controller #2 (rev 09)
00:1d.2 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB 
Controller #3 (rev 09)
00:1d.3 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset UHCI USB 
Controller #4 (rev 09)
00:1d.7 USB Controller: Intel Corporation 631xESB/632xESB/3100 Chipset EHCI 
USB2 Controller (rev 09)
00:1e.0 PCI bridge: Intel Corporation 82801 PCI Bridge (rev d9)
00:1f.0 ISA bridge: Intel Corporation 631xESB/632xESB/3100 Chipset LPC 
Interface Controller (rev 09)
00:1f.1 IDE interface: Intel Corporation 631xESB/632xESB IDE Controller (rev 09)
00:1f.2 SATA controller: Intel Corporation 631xESB/632xESB SATA AHCI Controller 
(rev 09)
00:1f.3 SMBus: Intel Corporation 631xESB/632xESB/3100 Chipset SMBus Controller 
(rev 09)
01:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Upstream Port 
(rev 01)
01:00.3 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express to PCI-X 
Bridge (rev 01)
02:00.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream 
Port E1 (rev 01)
02:01.0 PCI bridge: Intel Corporation 6311ESB/6321ESB PCI Express Downstream 
Port E2 (rev 01)
05:0b.0 SCSI storage controller: LSI Logic / Symbios Logic SAS1068 PCI-X 
Fusion-MPT SAS (rev 01)
07:00.0 VGA compatible controller: nVidia Corporation G71GL [Quadro FX 3500] 
(rev a1)
0b:00.0 Ethernet controller: Broadcom Corporation NetXtreme BCM5752 Gigabit 
Ethernet PCI Express (rev 02)
0c:0a.0 FireWire (IEEE 1394): Texas Instruments TSB43AB22/A IEEE-1394a-2000 
Controller (PHY/Link)

$ cat /proc/cpuinfo 
processor       : 0
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 0
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5323.69
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 1
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 1
siblings        : 4
core id         : 0
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5320.07
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 2
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 1
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5320.05
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 3
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 1
siblings        : 4
core id         : 1
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5320.06
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 4
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 2
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5320.04
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 5
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 1
siblings        : 4
core id         : 2
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5320.05
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 6
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 0
siblings        : 4
core id         : 3
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5320.03
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

processor       : 7
vendor_id       : GenuineIntel
cpu family      : 6
model           : 15
model name      : Intel(R) Xeon(R) CPU           X5355  @ 2.66GHz
stepping        : 7
cpu MHz         : 2660.000
cache size      : 4096 KB
physical id     : 1
siblings        : 4
core id         : 3
cpu cores       : 4
fpu             : yes
fpu_exception   : yes
cpuid level     : 10
wp              : yes
flags           : fpu vme de pse tsc msr pae mce cx8 apic sep mtrr pge mca cmov 
pat pse36 clflush dts acpi mmx fxsr sse sse2 ss ht tm pbe syscall nx lm 
constant_tsc arch_perfmon pebs bts rep_good pni monitor ds_cpl vmx est tm2 
ssse3 cx16 xtpr dca lahf_lm
bogomips        : 5320.06
clflush size    : 64
cache_alignment : 64
address sizes   : 36 bits physical, 48 bits virtual
power management:

I'm available to provide any other information anyone needs.
Thank you.

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Some Java programs doesn't display characters correctly when scrolling bottom 
and up with scrollbar
https://bugs.launchpad.net/bugs/240818
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