Hello, 

I've been using Gerbv on Mac OS X snow leopard, without any problems for 
a while now.  I haven't generated any gerbers in a few months, but 
recently found that gerbv 2.4 and 2.5 crash under Snow Leopard (and 
Lion) using both the native X11.app, and the latest XQuartz servers.  
Gerbv works fine with the fast and XOR rendering modes, but crashes when 
attempting the normal and high-quality modes.  I get this in the crash 
report: 

Thread 2 Crashed: 
0   X11.bin                           0x000000010001bc1b 
RootlessComposite + 129 
1   X11.bin                           0x00000001000bab39 
ProcRenderComposite + 374 
2   X11.bin                           0x000000010005b781 Dispatch + 751 
3   X11.bin                           0x0000000100069cac dix_main + 1309 
4   X11.bin                           0x000000010001149e server_thread + 50 
5   libSystem.B.dylib                 0x00007fff849fefd6 _pthread_start 
+ 331 
6   libSystem.B.dylib                 0x00007fff849fee89 thread_start + 13 


I can't say if the problem is in a bad Gerbv call, or whether something 
in the OSX or Xquartz distribution has changed; I can say that gerbv 2.4 
used to work with Snow leopard, but with all the snow leopard updates, 
it is likely that some libraries have changed in addition to the 
server.  Does anyone have some ideas what could be happening here? 

I did find a patch for 2.5.0 with XQuartz posted back in May 2011, which 
I did apply, which appears to address a different issue, and did not fix 
the crash. 

I'd be grateful for any insight, as Gerbv is really the most useful in 
these higher-res modes, and it's my go-to tool for examining Gerbers.  
(I do have the Altium gerber tool, but I believe it's best to use an 
independedn 3rd party tool for gerber examination.) 

Thanks for all the work producing this outstanding tool! 

Best regards, 

Dave 
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