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This bug was originally marked as duplicate of bug 239791, that is already resolved. This bug is still valid, so this seems to be another bug, but it might be related. Build: NetBeans IDE 8.0 (Build 201403101706) VM: Java HotSpot(TM) 64-Bit Server VM, 25.0-b70, Java(TM) SE Runtime Environment, 1.8.0-b132 OS: Linux User Comments: GUEST: activate C/C++ feature from Options/C++ panel Stacktrace: java.util.ConcurrentModificationException at java.util.LinkedHashMap$LinkedHashIterator.nextNode(LinkedHashMap.java:711) at java.util.LinkedHashMap$LinkedKeyIterator.next(LinkedHashMap.java:734) at org.netbeans.modules.options.TabbedController.initTabbedPane(TabbedController.java:190) at org.netbeans.modules.options.TabbedController.access$100(TabbedController.java:82) at org.netbeans.modules.options.TabbedController$1$1.run(TabbedController.java:97) at java.awt.event.InvocationEvent.dispatch(InvocationEvent.java:311)
Created attachment 146462 [details] stacktrace
This should be fixed by http://hg.netbeans.org/core-main/rev/84620f9afbd4. Please try a latest build and reopen if it happens again. Thank you for reporting