Product Version = NetBeans IDE Dev (Build 201203090400) (#9a710a8e3e80)
Operating System = Mac OS X version 10.7.3 running on amd64
Java; VM; Vendor = 1.7.0_04-ea; Java HotSpot(TM) 64-Bit Server VM 23.0-b16; Oracle Corporation
Runtime = Java(TM) SE Runtime Environment 1.7.0_04-ea-b15

http://netbeans.org/bugzilla/show_bug.cgi?id=209302

Steps to reproduce in NetBeans IDE:
- create PHP project and edit php file
- press Cmd+W to close
=> very often the dialog asking to save/discard changes is opened twice

Another scenario in NetBeans IDE:
- try to toggle bookmark in editor (php file) using Shift+Cmd+M
=> the bookmark icon sometimes hides and displays but sometimes nothing happens (like if the keyboard shortcut was pressed twice very fast)

Maybe related to bug #7147817 which was fixed in 7u4 b13 and verified by NetBeans QA.