Hello,
I use all defaults settings.
And I have just installed Musescore and have this bug immediately.

When I quit musescore, I have like a lag and the sound of others apps I
here again.

On my screenshot, the music is playing in VLC.
I have opened pavucontrol, I see the volume of VLC move with the music.

But,  when I open musescore, the volume is in pavucontrol is freezed,
and I ear no sound of all others apps (same for notification sounds of
Ubuntu)


When I quit musescore, the sound lag 1s and it can be ear again for all apps, 
the volume in pavucontrol move a with the music again.

I can test with others computer to test, but on the same computer I have
try with my 2 sound cards and same if VLC use one card, and Musescore
the other card, the problem persist.

** Attachment added: "Capture du 2014-06-03 14:29:35.png"
   
https://bugs.launchpad.net/ubuntu/+source/pulseaudio/+bug/1325752/+attachment/4124770/+files/Capture%20du%202014-06-03%2014%3A29%3A35.png

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https://bugs.launchpad.net/bugs/1325752

Title:
  All apps become mute when certain apps are opened.

Status in “pulseaudio” package in Ubuntu:
  New

Bug description:
  Hello,
  I have a problem with PulseAudio on Ubuntu 14.04 LTS. (This problem is not 
present for Ubuntu 12.04 LTS)

  If you start a music, for example with VLC, a mp4 or a flac (or all
  others files), or a video on Youtube with the Adobe flash player, or
  all program who use PulseAudio.

  If you start a program like Musescore or Mixxx, all others programs
  become mute. It's a bug, because the volume indicate the program have
  a volume of 100% but no sound.

  If you exit Musescore or Mixxx, you can ear all others programs again.
  (Instantly)

  
  On Ubuntu 14.04 LTS the bugs is produced each time.
  If you use pavucontrol, you can see the volume of VLC or others apps freezed 
when Musescore is opened.

  I haven't tested Mixxx on Ubuntu 12.04 LTS so I can't compare, but for
  Musescore it's certain that the problem had appear on Ubuntu 14.04
  LTS.

  (I have installed all updates, and I use only apps on the official
  repository of Ubuntu)

  Version: pulseaudio 4.0
  Thank you.
  --- 
  ApportVersion: 2.14.1-0ubuntu3.2
  Architecture: amd64
  AudioDevicesInUse:
   USER        PID ACCESS COMMAND
   /dev/snd/controlC1:  valentin  29817 F.... pulseaudio
   /dev/snd/pcmC1D0p:   valentin  29817 F...m pulseaudio
   /dev/snd/controlC2:  valentin  29817 F.... pulseaudio
   /dev/snd/controlC0:  valentin  29817 F.... pulseaudio
  DistroRelease: Ubuntu 14.04
  InstallationDate: Installed on 2014-03-28 (65 days ago)
  InstallationMedia: Ubuntu 14.04 LTS "Trusty Tahr" - Beta amd64 (20140326)
  NonfreeKernelModules: nvidia
  Package: pulseaudio 1:4.0-0ubuntu11
  PackageArchitecture: amd64
  ProcEnviron:
   LANGUAGE=fr_FR
   TERM=xterm
   PATH=(custom, no user)
   LANG=fr_FR.UTF-8
   SHELL=/bin/bash
  ProcVersionSignature: Ubuntu 3.13.0-19.40-generic 3.13.6
  PulseList:
   Error: command ['pacmd', 'list'] failed with exit code 1: Home directory not 
accessible: Permission denied
   No PulseAudio daemon running, or not running as session daemon.
  Tags:  trusty
  Uname: Linux 3.13.0-19-generic x86_64
  UpgradeStatus: No upgrade log present (probably fresh install)
  UserGroups:
   
  _MarkForUpload: True
  dmi.bios.date: 01/20/2014
  dmi.bios.vendor: American Megatrends Inc.
  dmi.bios.version: 0806
  dmi.board.asset.tag: To be filled by O.E.M.
  dmi.board.name: H87-PLUS
  dmi.board.vendor: ASUSTeK COMPUTER INC.
  dmi.board.version: Rev X.0x
  dmi.chassis.asset.tag: Asset-1234567890
  dmi.chassis.type: 3
  dmi.chassis.vendor: Chassis Manufacture
  dmi.chassis.version: Chassis Version
  dmi.modalias: 
dmi:bvnAmericanMegatrendsInc.:bvr0806:bd01/20/2014:svnASUS:pnAllSeries:pvrSystemVersion:rvnASUSTeKCOMPUTERINC.:rnH87-PLUS:rvrRevX.0x:cvnChassisManufacture:ct3:cvrChassisVersion:
  dmi.product.name: All Series
  dmi.product.version: System Version
  dmi.sys.vendor: ASUS

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