There are a category of exceptions which make the IDE very annoying to use. The IDE gets into a bad state, and exceptions are thrown every 5-10 seconds. Instead of forcing the user to downgrade to an older (hopefully more stable) dev build the exception reporter should do a better job of handling these cases.

It should keep track of recently-reported exceptions. If the same exception is fired a second time, it should automatically file a duplicate report to netbeans.org without prompting the user with the error dialog.

Or, at the very least, provide the user with an option to suppress this exception (until Netbeans is restarted) and silently report suppressed exceptions in the background without user intervention.