I have a similar problem-good to know you fixed yours and could you post how you fixed it? This may help me & anyone else who gets this error!
Here is my post from another thread:
I am experiencing a similar problem after updating bbPress & BuddyPress plugins on my WP theme (on 06/08/12):
Fatal error: Class 'BBP_Theme_Compat' not found in /home//public_html/richard-dickinson.com/wp-content/themes/animassrdblogbp_kid/functions.php on line 32
I will try & fix by checking the advice given here & would appreciate more help if anyone knows the best way I can fix this-thanks