The only issues I've experienced were sorted by moving to the OpenGL renderer, so I can't help, but I guess useful information you could provide would be:
* The version of Sublime you're using
* The version of Windows you're using
* Information on your graphics card
If you weren't using the latest beta, I would certainly say to give that a go
. For what it's worth I find the Sublime Text betas to be very stable, though obviously your mileage may vary.