No graphical environment after latest snapshot

Hi, My son's system fails to get into a graphical environment after the zypper dup --no-allow-vendor-change issued yesterday (to TW 20230917, kernel 6.5.3.-1-default). Trying to issue startx, the Xorg.0.login his home environment says "Failed to initialize the NVIDIA kernel module¨. Is something wrong with this snapshot? (We thought about doing a snapper rollback, but snapper says snapper is not configured - isn't that done automagically when installing TW? It is configured in my own system, and I can't remember having done that myself.) Thanks again for any suggestions! regards, Jogchum