Getting Errors (suddenly)

Guys,

This plugin was working great now we are getting these issues? Using the latest version of UF, and WPMU latest.

this is occurring on a subsite. Again, it was working before the plugin upgrade and now it is tell me these things

February 15, 2012 5:41 pm 	admin 	post_on_facebook 	exception 	OAuthException: Error validating access token: Session has expired at unix time 1328904000. The current unix time is 1329327681.
February 15, 2012 5:43 pm 	admin 	post_on_facebook 	exception 	OAuthException: Error validating access token: Session has expired at unix time 1328904000. The current unix time is 1329327823.
February 15, 2012 5:46 pm 	admin 	post_on_facebook 	exception 	OAuthException: Error validating access token: Session has expired at unix time 1328904000. The current unix time is 1329328004.

thoughts?