Fonts wrong size and not displaying properly after upgrade to F33

[Stephen Morris]

Hi,
     When Thunderbird highlights a mail line in, say, my inbox the 
bottom of the highlight bar is right on the bottom of the text making it 
look like the bottom of the text is chopped off. The same situation 
happens with icon labels on the desktop. Also the text in the taskbar 
entries for running applications is completely garbled and in konsole 
the cursor displays two to three characters past the end of the 
character being typed in.
     I'm using version 84.0a1 of Thunderbird.
     I'm using KDE in xorg. I haven't tried KDE in Wayland now have I 
tried any of the Gnome options as yet and I'm using gdm as my display 
manager.
     Has anybody seen this issue with F33 after an upgrade from F32, or 
know what I can look at to rectify the situation?

regards,
Steve