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This is a known problem on the nikons (F70 also). You can't do much about it except peel it off or try and wipe it off with chemicals.Probably the best solution on the F90 is to replace the back with a M25 or M26 databack or even a standard door. You can pick those up cheap on ebay and the replacement is easy.
this happens when the shutter speed is not correct. set the speed to 1/60 sec.
if the X-370 flash is new it may not be compatible with your camera. with the flash turned on it should set the shutter speed automatically to either 1/60sec or 1/125sec. looking in the finder the shutter speed should not change to various amounts of light. if the shutter speed changes with the flash turned on it is not dedicated to your camera.