CCarpenter, did this occur after you switched your compositor like described above and looks good again if you change to another setting?
If not, try another theme (switch to Oxygen, relogin, switch to breeze-dark, relogin...). And as a last thought, check the fonts in systemsettings, perhaps it is something like "Droid fonts got replaced by Noto fonts during D-U, but not completely". If so, change all fonts and then regenerate font cache (in terminal fc-cache -vr).