PtBi and GeForce 310 driver series

It has been brought to my attention that the latest beta GeForce drivers break compatibility with PtBi. Since the error message they report isn’t particularly helpful, I’d like to wait until there’s a WHQL release to investigate this further.

For now, I suggest sticking with the 306.97 driver release.

The next release of PtBi (which I’ll make after the final release of the new driver, and after I fixed the issue if it still persists in that release) should also slightly decrease latency in some configurations.