This article will help explain the purpose of the red notification when self coving concave shapes(rooms), outside corners and curved walls.
Commercial MeasureSquare 8 Build 7765 & after
This message is notifying you that MeasureSquare 8 cannot seam/cut correctly for self coved outside corners (concave shapes). See the screenshot below, the piece that would be fitted using a miter type cut is what MeasureSquare 8 is unable to fill from the waste on the cutsheet. This is technically a very small amount of vinyl that would rarely not be covered by waste.
The way it is estimating has not changed, you can disable the message under System settings -> Advanced Tab -> Uncheck the box for Self Coving on Concave -> Save
Click Estimate > Select all or select the products that need to re-estimate > Ok and the qyt will no longer showing up red with the exclamation marks