On some computers YoWindow Screensaver was not able to start.
That was a hard to discover problem.
However, we have managed to find the source of the problem and have fixed it (it was hard).
Please download and install the latest version of YoWindow from our site.
http://yowindow.com/download.shtml
Most likely the problem is solved and YoWindow screensaver will open successfully on your computer.
If you want to thank me, please vote for YoWindow on Stumbleupon
http://www.stumbleupon.com/url/www.yowindow.com/