You can lose radar function by playing with the sweep icons. In certain unpredictable click combos they get "stuck." Saving and restoring with the radar in "normal" mode (hand enabled, continious sweep enabled) seems to get it back working in the stock game. You should be able to turn the surface radar (hand) and continuous sweep on and off safely, but I have a lot of trouble toggling the other mode combos.
-Pv-
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