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Don't know how reproducible this can be - it happens to me right after starting the IDE when trying to open project using File -> Open Project action
Created attachment 52897 [details] thread dump
Product Version: NetBeans IDE 6.0 RC1 (Build 200711120000) Java: 1.6.0_04; Java HotSpot(TM) Client VM 10.0-b18 System: Windows XP version 5.1 running on x86; Cp1252; en_US (nb) Userdir: C:\Documents and Settings\lukas\.netbeans\6.0rc1
seems to be a duplicate of issue 109703 *** This issue has been marked as a duplicate of 109703 ***