I keep getting this error when trying to load a map:

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Everything was working fine, then I used a bad keystroke (I think CTRL SHIFT 4) and closed the map (normally black screen). I have tried a lot of keystroke combos, looked everywhere in options trying to get it back. Uninstalled and re-installed MySEQ, and am still having this problem. I would really appreciate any tips if someone knows how to fix this. Thank you.