Try lowering your "posts per page" option in the settings. IIRC, there is a problem with setting it too high and then trying to view the longer threads.
I have mine set at 100 and it works fine.
I'm surprised they have not fixed it or removed the 500 option by now.
Nice, that seems to have fixed the issue.
Many thanks!! 
Yeah, there are many issues with vBB. It's a step above uBB, but not a big one. 
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Biggest Troll on the forums? I'll give you a hint:
I'm not sure if this is a bug or if it's my browser. There's been about a dozen times now that I've tried to view a forum post, random posts, and all I get is a white screen. I try to reload the page multiple times but still stuck with a white screen. I've tried closing the browser and reopening it but still getting a white screen.
This is a mildly annoying issue. Is there anything I can do to fix it?
My browser is Comodo Dragon v4.1.1.12