Repro Steps:

1) Create a Page, and select the RootGrid
2) From the Properties Panel, open the Opacity Mask panel, and add a 2-point LinearGradientMask as the Opacity Mask Property.
3) With the Brush Panel still open, select the first Gradient Stop, and click on the Offset input box (a blue text highlight will appear on the % value)
4) With the Offset input still active, click on the other/second Gradient Stop.

Observe Studio crashing.

Expected results: Stops should be selectable without crashing regardless of which input box is currently active.