I don't know why this happens, but when I move my program's window, the window stops updating until I let go of it (I'm using DirectX by the way). I'm sure fixing this can't be too complicated.

I don't know for sure, but what if you call:set_display_switch_mode(SWITCH_BACKGROUND);

Uhh would you know where is the Allegro source that function is, I've been looking but can't seem to find it.

Uhh why do you care?

It also might have to do with the video card. I actually worked on one machine where I had to move the window to have it updated. Made playing games...interesting. A simple upgrade of the drivers help. Just thought I'd mention.

I'm using DirectX not Allegro, so maybe if I had a look at the function that would help.

Oh. In that case, the function won't help anyways.