Using the Mac_styles branch with my quite complex UI, crashes with:

Illegal instruction: 4

when packing a ttkFrame containing a ttkEntry widget.

Unfortunately I could not create a minimalist code to reproduce the issue. I have a window with some nested frames (<10). A previously created ttkFrame containing a ttkEntry, when packed, makes the UI crashing.

Attached, the crash report from macOS (crash report_), in the hope that it can shed some light.