Issue: When creating a new record and after populating that record the user tabs through the field. When finished the user clicks on a button (not a button bar) in the Header.
On Windows, FM crashes. FM does not crash on Mac. FM does not crash on existing records.
To replicate, create a layout with several fields and a tab control with several tab options. In Layout Mode, make sure the Set Tab Order... includes the tab control.
I was able to solve the issue by removing the Tab Control from the tab order.