[Jare]

We once found that the floating point precision bit could change at unspecified times in our game. This destroyed any hope of deterministic computations for networked lockstep games or game replays. We tracked this to some driver or dll hooking into the full-screen switching process for DirectX (could be a mouse driver, or a gfx driver, or who knows what else). It only seemed to happen in pre-NT versions of Windows.

We just forcefully reset the bit after any call to the Windows message pump, and that was the last of our network desyncs gone for good. Ship it!

(I recall DirectX later added some flag related to this, but memory is hazy)