Ctrl + M: Enter Mark mode (allows you to select text with mouse). Once Mark mode is enabled, you can use the arrow keys to move the cursor around. Shift + Up or Down: Move cursor up or down one line ...
You wouldn't happen to be running the Wingman profiler for a Logitech Gamepad or Joystick, would you? I had a similar problem and Wingman was the culprit.
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