When error comes up windows messenger will log itself back out.
But if you log into messenger while in windows aero (Windows default) then change themes there is no error
But the error is recreatable even then (sign into messenger in windows aero and change themes (No error) then sign out and re login (Then you have the error again)
So if this could be fixed It would run nicely (P.S. Just my opinion Major props for the new interface, personally I beleive this point out it should be default whith the option to choose to regress to the older style.)