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Build: NetBeans IDE Dev (Build 200710031200) VM: Java HotSpot(TM) Client VM, 1.5.0_07-87 OS: Mac OS X, 10.4.10, i386 User Comments: Copied rhtml file in the projects window from one folder to another.
Created attachment 50358 [details] stacktrace
I can't reproduce this with current bits. I could both drag the file to other folders as well as use the copy/paste actions. Please reopen if this is still broken for you.