[Mr_Devlin]

Then it sounds like a Flashchat issue which is out of scope for this mod - you need to ask on the Tufat forums - However, I would suggest you check what prefix have you defined for Flashchat to use (in config.srv.php).

I tried several installations with different prefixes like fc_ or flashchat_ with same results.
The installation reads existing fc tables (without a users table!) properly but in usage it will try to read the (not installed) fc_users table.
I dropped the existing tables and made a fresh install but also with same result: FC creates the required tables (no fc_users table!) but tries to read from its own (not available) users table.

I will have a look for solution on this @ tufat...