Stumbled upon this today.
Got an autoplane, scanned circle method
Evaluating perpendicularity for this plane
So far so good.
The scanpoints/scanpath from this scan (orange dots) were lingering in the graphics view
so I F9:ed the plane and clicked OK - without changing anything, just clicked OK.
The scanpoints/scanpath disapperared, but now the perp evaluation shows zero, which
means that when I clicked OK in the autoplane, the measured hits were removed.
The measured values were still correct (ie. they were not = THEO).
We've had a version of this bug earlier, but that was also clearing the MEAS values
to THEOS.