Gray / black transparent box stuck on macbook pro

I went into my user account settings and clicked on "Login Options" all that happened was a transparent black /gray box appeared in the upper right. I have loged out then back in and I have rebooted. That box is still there.
Just to add more information: the box looks like the quicktime fullscreen controls except with no controls on it. It doesn't move and it doesn't interfere with clicking etc. It is just very annoying. I took a screenshot and posted it here:
http://bp0.blogger.com/_mseD1ap1W2E/R9t4coGVAvI/AAAAAAAAAVo/R-zFnWtzAis/s1600-h/ Picture+1.jpg

I need to follow up with: I went into the settings again and messed around. If I disable fast-user-switching then the box disappears, if I enable it, the box comes back.
Another (probably important) note is that I am running winswitch software. Could be a glitch?

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