internal vBSEO error

Hey,

I turned my forum off... and all of a sudden all I get is:

"internal vBSEO error"

I tried turning it back on... Nothing...
Disabling it... when i disable the global hook, it works for the front page of the forum, but all other links give the above error...
Disabling / Enabling vbseo does nothing...
tried reinstalling vbseo... and still same thing...

Thanks,

Tom