The same thing happens on my pc. With Basic2D as an example. As soon as my mouse is on the edges of the window then everything in the application stops moving. If I have the mouse inside the window then it's alright and also outside.

It's just on the borders itself when the program stops. I'll test with music in the next couple of days to see if the music continues playing.

I'm also using Vista x64 with a Nvidia graphics card, not SLI though.

Oh and great library by the way. ClanLib is a dream compared to libraries I've used before it.