I have an update on this. It seems to have something to do with autocorrect and stacked fractions. Not sure if this is unique to my set up. I have MacBook Pro 8,2 running macOS 10.13.6. Running VW2021 sp4.1 Here is what happens:
Scenario 1: I have a circle or any geometry, not unique to circles, I edit the diameter in the OIP by subtracting 1/2" macOS autocorrects to ½" and VW2021 fails to do the math
Scenario 2: I have a circle with a diameter that has a fraction in it, say 10' 0 1/2" I click on diameter to edit in OIP, say *2, macOS autocorrects the fraction in the diameter to a stacked fraction (10'0 ½") and vectorworks fails to do the math
Anyone else seeing this behavior?