Yast2 modules don't start: The mouse pointer turns "busy", then goes back to
normal with absolutely no action or further indication of what might be wrong.

Running yast2 from a shell window revealed that the qt module is missing.  It
turns out that I had libyui-qt6 installed, whereas the Yast2 module in question
depends on libyui-qt7.  I installed libyui-qt7 via zypper and the Yast2 module
now starts up correctly.

Please fix the dependencies so that the (update) installation is not missing
required packages.