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usually, I use the measuregeom tool to measure the length/distance quickly.
like this
But I don't know why quick measurements don't work today. I have to pick the option first, then select the base point to get the measure.
Rotated UCS? Look at your cursor, there is a question mark, commandline probably says something about that too (make sure it is 3-5-10 line tall for now).
It remembers the last measurement mode you used, and starts with that. You must have just gotten into the Diestance option somehow. Pick the little pulldown and choose Quick again:
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