And the offending line in ubbthreads.php is....

@include("cache/forum_cache.php");

Which again seems to point to the cache just blowing up overnight to the point that it overwhelmed things...and now can't load.

Is there a way to manually clear this - I don't have any access to the UBB frontend/backend.

Can I just clear out the 'cache' directory and it will autorebuild?

thanks for any help.