Have you accidentally enabled a MIDI key-switch in Keyboard Shortcuts? If it looks like this, that could be your problem: The above sets the sustain pedal to be your SHIFT key. Make sure the "Enabled" checkbox is unchecked. For good measure, set the controller to something you'll never use (I've set mine to "breath"). This will stop this happening again if you do decide to enabled MIDI shortcuts e.g.:  
    • Great Idea
    • Like
    2