There is one serious bug in the current tabSRMM chat integration:

If you have the chat integration enabled and disable all protocols which are using group chat (currently: Jabber, MSN and IRC register as modules with chat.dll), Miranda will crash on startup with an integer division by zero.

In order to solve this, you'll either have to remove tabSRMM from the plugins directory and then re-enable the protocols or install a new protocol which uses the group chat feature (you can temporarily make a copy of msn, irc or jabber and then restart Miranda - the new protocol will be enabled by default and the crash shouldn't happen then).

The bug is fixed in SVN revision 117 (rev from May, 11).