UBB.threads PHP Forum Software Community Forums General Suggestions and Feedback Google not crawling my site

HELP! When I do this in google:

site:www.britishcarforum.com/bcforum/ubbthreads.php/ubb/showflat/

It only returns 3 results and the ONLY post that is actually there is one that is accessable from out on my portal page. NONE of my other "threads" seem to be indexed by Google. What the heck is going on? I see a single Googlebot on my site, but It seems that none on my threads are getting indexed - ZERO, ZIP, NADA. I must figure this out! Help!