If you're using TDW's NewUI + TDC, it maps a key to "K" via scripting, which overrides the commands.cfg stuff. Change your mapping to something else, or find the line:
Quote:
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IncreaseChalkBoardCountHotKey = [ True, MenuKeyManagerWrapper.Keys.K, False ]
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in the TheDarkWraithUserOptions.py file and change that mapping to something else.