Flashing icons (crashing gui) in OSX Yosemite
Tracking your problem in Crash report it shows

Thread 8 Crashed:: Dispatch queue: ICANotificationPrivateQueue
0   libobjc.A.dylib                 0x00007fff91893acf objc_release + 15
1   libobjc.A.dylib                 0x00007fff9189291f (anonymous namespace)::AutoreleasePoolPage::pop(void*) + 575
2   com.apple.CoreFoundation        0x00007fff95cb6272 _CFAutoreleasePoolPop + 50


So one of the existing icons is making problems, my hint is the Volume or the Clock.

One way to find out is to trash them one by one (hold cmd and pull it to the desk top). No worry they can be easily restored from here /System/Library/CoreServices/Menu extras.