Well, I gave up, and reinstalled C7. This time, I realized I needed to make a software choice before the install, and did so.
My install, yesterday, was a minimal. Silly me, yesterday, after that, I did a groupinstall of KDE Plasma Workspaces... and it did *NOT* include all the dependencies to run KDE.
Having installed a KDE desktop, much is better... with one exception: I can't seem to find any games. I tried yum groupinstall "Games and Entertainment", which showed when I did group list... and was told it was empty.
Now what am I missing? I do have epel and rpmfusion, both free and non-free.
mark