Originally Posted by csphua
Yes.
The blinking shutter speed means that the camera's autoexposure meter thinks a different shutter speed is necessary to achieve a proper exposure for the scene, but the camera can't change the shutter speed for some reason.
The 50D can achieve flash sync at anywhere between 1/60 and 1/250. If your scene is too dark, and 1/60 is not slow enough, then it will blink to tell you that the shutter speed does reach proper exposure for the ambient light.
If it was blinking 250, then it would mean that the scene luminance is too high for 1/250.
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