I've run into a very distressing situation with my D300S. I can't select a shutter speed faster than 1/250th second (the max flash sync speed). I MUST STRESS HERE -- THE FLASH IS NOT ENABLED. Only the range from Bulb to 1/250 is enabled. No matter how much I spin the selector wheel, I can't go to 1/500, 1/1000, etc.
I've look closely at the camera to ensure there are no dirty contacts that might fool the camera into thinking that the on-board flash is in the "popped-up" (enabled position) which does, on the '300, limit the shutter speed, but this is not the case.
I'm in quite a quandry. Big photo shoot upcoming in a couple of days and have never seen my beloved camera misbehave like this. I find absolutey no help Googling this problem.
Any/all help would be appreciated.