Windows phone7 emulator requires constant refresh

I have the tools installed for windows phone 7 development.

But, when I run the any of the s开发者_JS百科ample apps I have to manually refresh my emulator's app window to see any changes.

Any ideas what I'm doing wrong? Or maybe a setting is wrong?

Thanks

I've got it on every machine I've tried- but they all have various Nvidia cards (desktop and mobile).

When I posted about this on the wp7 forums, they talked about wdm 1.1 (which I've got) and so far I have no fix.

My machines are all 64bit, so I'm wondering if this isn't some issue with them or the nvidia drivers- but I don't experience any other problems with the drivers outside of the emulator.

I think we're stuck for a while anyway...