error on facebook connect when using facebook chat plugin

When I have the wordpress chat plugin activated and I go to log in using a wordpress connect through ultimate facebook if I am not currently logged in in that browser session it prompts me to first log into facebook, which I do, then it goes through the motions of signing in, but it doesn't sign in. This is definitely a conflict between the chat plug-in & ultimate facebook - I have checked the box to confirm I am already using ultimate facebook in the chat plug - in & this only happens if I am not already logged in.