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Created attachment 139896 [details] log file with the exception stacktrace Environment: Product Version: NetBeans IDE Dev (Build 201309090001) Java: 1.7.0_40; Java HotSpot(TM) 64-Bit Server VM 24.0-b55 Runtime: Java(TM) SE Runtime Environment 1.7.0_40-b40 System: Mac OS X version 10.7.5 running on x86_64; UTF-8; en_US (nb) User directory: /Users/ionuion/Library/Application Support/NetBeans/dev Cache directory: /Users/ionuion/Library/Caches/NetBeans/dev Steps to reproduce. 1. Create new maven project (maven > Java Application) 2. Open App.java in the editor. 3. In the Projects window right click on Delete. 4. In the Delete Project dialog, check 'Also delete sources under "..."' Result: MutexException thrown. Please see attached message.log