Since about a few month ago our support started to receive sporadic reports about inability to run our applications, downloaded from our website. Applications itself is properly signed and codesign check passes well. However customers sent us several console logs and we've found tricky records there:
10/19/15 15:42:32.979 CoreServicesUIAgent[30385]: Cannot load Interface Builder file '/System/Library/Frameworks/AppKit.framework/Resources/English.lproj/NSAlertPanel.nib'
10/19/15 15:42:32.979 com.apple.xpc.launchd[1]: (com.apple.xpc.launchd.oneshot.0x1000007d.APPLICATION[51602]) Service exited due to signal: Killed: 9
The culprit is a Gatekeeper however nib(s) (the same but path vary for different OS languages) itself at place and with proper permissions. Once customer switch off Gatekeeper y settings ability to run application downloaded from anywhere (opposite to default MAS + identified developers), application runs well after passing verification and shows dialog about whether one want to run application downloaded from the internet. While that options being set to default "MAS + identified developers" only reaches "Verifying…" and after that quits with console log record as above.
This appeared to be now on all OS X version since 10.8 and higher (or app can't be run on lower) and looks like appeared sometime around 10.10.3 release or so. It is extremely sporadic since may appear on one computer and doesn't on the same nearby with exactly the same OS X and environment.
I would like to ask if anyone else experienced this problem and whether you were able to find the solution.