I have discovered that any time one of the dials (istD or K20D) is not clicked into position (both e dials and focus point selector). That is, when any of the dials is left of moved out of position, then strange things start to happen, like erroneous information, camera won't shoot, camera freeze or whatever strange behavior you can think off.
Make sure all three dials (both e-dials and focus point selector) are correctly clicked. Also, if using BG grip and its ON, those extra e-dials will screw up if left between clicks.
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