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When starting Netbeans on Linux it sometimes presents an error (stop sign in the bottom right corner) which, after clicking on it, turns out to be the error in the Summary. The odd part (for me) is that this problem only occurs sporadicly without any changes to the Java environment (apart from some possible changes in my projects source ofcourse). The error also doesn't produce any problems with the use of the IDE itself. The full log can be obtained from the above URL.
This has long been fixed as it has never been showing up on 5.5.x and I am even wondering if I wasn't too hasty in adding this to the database. Sorry for the delay in closing this down.