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I ran into this same problem. @fergs's answer is the correct diagnosis, but it does not actually help you fix the problem. The gui will only show up when the first pair of synchronized images is received, and if it never receives images at the same time, the gui will never show up.

The solution is to append --approximate=0.005 to your call to tell camera_calibrate to accept unsynchronized images within the given time threshold. I had to use a value as high as 0.1 before it worked with some especially slow USB webcams.