"Units/Precision" button doesn't work in Measure tool.

Good morning,

I'm trying to adjust the number of decimal places in the "Measure" tool, but when I click on the "Units/Precision" button, the top part of the box gets cleared out, and I can't do anything else. I have to close the command and restart it to do anything. I have the units in the document properties set for 3 decimal places, but there are times I want a little more precision, and I can't get it to work. This is rather frustrating.

Thanks for your help!

Al

SolidworksParts And Features