Thanks for your comment about “VSE: cannot undo strip cuts”. We can conclude that Blender should’nt reject “undo” in this case. I’ll keep an eye on other possibilities as you stipulate.
I’ve figured it out. May I inform you about a bit bizarre observation concerning the VSE Undo-matter:
If you leave the 3D workspace in “Edit Mode” Undo won’t work in VSE. You must set the box to “Object Mode”. If you don’t know this its quite frustrating, but I guess somehow it makes sense in the overall UI.
Kind regards and thanks again from a white and chilly CPH,
Mikael