I wouldn't wanna disable it, but it happens to me also, I'm running vista with current updates, exiting fulltilt then re opening solved it for me!
Same thing happened to me today and confused the heck outta me. I was playing 2 tourneys on full tilt and 1 on another site and only the 1 full tilt table kept popping up...the other flashed in the task bar when it was my turn. Going to options and unchecking the "bring table to the front" didnt help....I logged on and off a few times and nothing helped?????
If someone said they logged off and on and that fixed it I'm sure they meant exiting the program and reopening it. Logging off and on won't reset the program and clear the bug. CLOSE fulltilt completely then reopen it, that seems to fix for people.