We've got an issue with the SDL build of our engine on Linux which doesn't occur in the Windows one (which doesn't use SDL), where the mouselook jumps frequently, regardless of scene load. When we replaced SDL_GetTicks() (to determine how far to turn the camera) with a constant number, the issue is solved, but of course this isn't a proper solution. But SDL_GetTicks() just uses GetTimeOfDay() on Unix, so we're rather stumped as to why this is happening. We're also doing mouse smoothing, so I doubt it's an issue there. Ideas?