Google indexing peaked at 12800?

I have VBSEO installed on my forums (HD and DVD Bargains), and the search engine indexing has been increasing steadily. However, a few weeks ago we hit 12,800 indexed pages and it has stayed there ever since.

Is there some setting that I have set incorrectly? Or am I just being impatient? My site has 100,000+ pages.

Your site have 5,077 threads. You shall want search engines to index your threads not posts.