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When trying to use the debugger I got the following exception (thrown in a dialog). Clearly something is trying to print a null string, though I don't know what. If you can't guess who it is, you need to at least put in an assertion into IOManager.println checking that the passed-in text is not null, so that next time there will be a proper stack trace.
Created attachment 14773 [details] Stack trace
fixed in main trunk
Verified ... and Closing all issues resolved into NetBeans 6.7 and earlier.