No unity bug report appears.
Crash file: Process: Unity [26575]Path: /Applications/Unity/Unity.app/C - Pastebin.com
Errors in the OSX console
2/29/16 6:59:27.394 PM Unity[26575]: Cannot load Interface Builder file ‘/System/Library/Frameworks/AppKit.framework/Resources/English.lproj/NSAlertPanel.nib’
2/29/16 6:59:29.867 PM com.apple.launchd.peruser.501[288]: (com.unity3d.UnityEditor5.x.182192[26575]) Job appears to have crashed: Abort trap: 6
Edit: it happens in 5.3.3p1