Subforums won't open

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All of a sudden a couple of my subforums have stopped opening. I can click on the latest thread and view but the subforum itself will not open. If I try to open the affected subforums the page just reloads. Anyone any ideas?

The only thing that has changed is that I installed Vbseo Gold last night.

--------------- Added [DATE]1246544674[/DATE] at [TIME]1246544674[/TIME] ---------------

...and that proved to be the source of the problem. Problem fixed.