In the French version, in "Dessiner" tab, Ctrl+Z don't "Undo last action" but makes the selected tab to jump from "Dessiner" tab to "Topo" tab. This also happens from any of the other tabs. This behaviour isn't observed in the English version, although if you press Ctrl+Z from "Drawing" tab, it will jumps to "Elements" tab.

Could it be a keyboard type issue? I.e qwerty vs azerty, Although it shouldn’t matter...

Restarted the PC this morning and checked if the issue was still there before upgrading to 9.1.3.... Gone. Looks like the PC changed its keyboard configuration to English US i.e. QWERTY so typing Ctrl+Z on the keyboard was actually a Ctrl+W... This doesn't explain the different behaviour between French and English versions I observed. However, I can't reproduce it this morning so rebooting the PC/software might have donne some good.

Thank you for your Information.