Thanks all. Sometimes one gets so busy trying to find things all over the net, they forget that this is the best forum there is.
Archie, did what you suggested: got this result
[root@localhost adrian]# switch-themes -c
The current theme is:
[adrian@localhost ~]$ switch-themes -l
Available themes are :
Which is a little odd as I uninstalled everything I could think of. So I reinstalled a theme and selected it through the cli with the switch-themes <preferred_theme> command as Archie suggested. Ran the switch-themes -u and rebooted with fingers diligently crossed.
Thanks to you, voila, my computer is (literally) Kosher again---no bacon!!!!
Thank you all for your help.
Keep ridin' that Penguin!!