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Navigate to Community->Sources->Browse online and all you see is www, not the whole nb.org source repository.
This is partially duplicate of issue 13534. The other part is WORKSFORME/INVALID. Please make sure your browser was pointed to URL http://www.netbeans.org/download/source_browse.html Also please note, that the page is automatically regenerated from time to time, so there could be concurrent access issues with the page during it's file update, but it usually takes a few second to complete the file update task.
It's working for me now as well, but I saw it on 2 different days over the last week, which is why I filed it.
We recently moved out from Collabnet's infrastructure