Every time I launch my TeamSpeak client or double-click to maximize its window - it opens up in Windowed/FullScreen mode and doesn't remember it's last position or size setting.

I've tried shutting it down using the CTRL + Left mouse click on the red X, same results.

As far as I know, this behavior seems to have started by itself.

I'm running under Windows 7 w/Administrator account.

Any ideas how to fix this besides trying to reinstall the software?