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Build 200905050201, JDK 1.6.0_13, Win Vista I started IDE with new userdir,created new Maven Simple project and tried to change Source level in Properties. It behaved normally,however when I changed source level from 1.3 to 1.5 and clicked OK, source level was unchanged,as I could see when I opened Properties again. If I shutdown the IDE and start again, there's now source level 1.5 set for the project, however if I change it back to 1.3 (it works) and then I want to change it to 1.5 again, it doesn't work now. There's no visible error message or exception anywhere.
Issue seems to be somewhat random and userdir connected. Using of new,clean userdir returns IDE back to normal.
most probably fixed by this: http://hg.netbeans.org/main/rev/2d3e6e03b3ed introduced by 3bfc8f8551ae its random as the affected cache relied on TimedWeakReference
I'm unable to reproduce issue,so far, so marking as verified.I'll reopen it once reproduced again.