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Product Version = NetBeans IDE Dev (Build 201212080001) Operating System = Linux version 3.5.0-20-generic running on amd64 Java; VM; Vendor = 1.7.0_09 Runtime = Java HotSpot(TM) 64-Bit Server VM 23.5-b02 it show a java.lang.AssertionError
then report it via exception reporter or at least attach the messages.log
I can confirm fortruth's report. The same error occurs while saving existing file as new one (using Save As)