Browser shuts down after nominating

Hi.

I'm sure there must be a sticky for this but couldn't see it immediately.

When voting for a track, there is a small windows that says thanks for voting and has a little X in the top right hand corner. When I click it, my browser shuts completely.

Any ideas what is causing that ?

[Added by edit]

Win 7 / 64bit [sp1]
Intel Core2 / Quad
4 Gb Ram
IE9


Regards.
Mike.

[Mykyndryd]

If you right click the "thumbs up" symbol and choose "open in new tab".
You get the aknowledgement in the new tab which you can then close without affecting anything else that's open.