Why won't any button in MF Toolbox (scanning software for Canon MF3010) do anything?

scanner printer

Had same problem, the buttons in MF Toolbox just stopped working. Uninstalling/reinstalling print drivers and toolbox didn't help, to fix it I had to manually add the Twain driver directory (c:\Windows\twain_32\MF4100\ for my Canon MF4100) to system path.

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