Calc freezes when I select a small block of cells

Having a problem with LibreOffice Calc running on Fedora Core 24 KDE spin.

When I select a small block of cells in a small worksheet, the whole Calc freezes.

Completely repeatable. Rebooted Fedora just to be sure, no change. to error condition.

I spoke too soon saying it was resolved, this problem still happens. Even with multiple iterations of the same file.

Not repeatable across different files. I saved the file with a new name, and all works fine.