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6.5 M1 under Windows XP SP3 Java classes listed in the Projects tree and open in the Editor are tagged all over the place with spurious error badged icons. Cleaning, rebuilding, and single-file compilation do not convince NetBeans that there are in fact no errors (source code does compile and proejects do build successfully). There seems to be some sort of caching problem involved. The Editor also will display tooltip labels like "Class expected, but Identifer 31 received" (this is from my memory, but it's something to that effect).
*** This issue has been marked as a duplicate of 121950 ***