It's affecting me too!
I heard it was something to do with overlays. Right now i have anything off that appears to have it such as Steam, Teamspeak, xfire etc... But I didn't think about ATI's tray tools. I will look into seeing how to disable this and if it works for me.
edit:
Turned off ATI's tool try but that didn't work either. I actually have everything now off and still get a boot.