PocketMatrix

I'm having trouble using PHAL 0.7.7 with the screen updates tearing on 3 different devices I've tried now - so it's something I've done wrong but I'm not sure where - have been comparing with a project I did a while back that didn't (and still doesn't) have the same issue. It's not just slightly noticible - it really stands out.

Has anyone else experienced this problem and know the solution off the top of your head?

I've tried the following:
- handling WM_ERASEBKGND, WM_PAINT
- using VSYNC option on Swap()
- slowing framerate to 10fps - doesn't matter what the frame rate is, and I can put sleeps in everywhere it still does it.

Thanks.