Same problem here. Was happening when I had Dapper, still happening in Edgy. I attached the crashlog "Bug Buddy" generated.
** Attachment added: "Generated crashlog" http://librarian.launchpad.net/5045955/grip-bugreport.txt -- Play/Pause button kills app https://launchpad.net/bugs/41601 -- ubuntu-bugs mailing list ubuntu-bugs@lists.ubuntu.com https://lists.ubuntu.com/mailman/listinfo/ubuntu-bugs