There is some issue with font preview rendering as you can see in attached image. This issue also discussed here: https://bbs.archlinux.org/viewtopic.php?id=200983. It is visible some rendered pixels on left and right sides of preview, so it looks like preview works, but some viewing area misconfiguration occurs. Reproducible: Always Steps to Reproduce: 1a. run `kcmshell5 fontinst` or 1b. open `System Settings` -> `Fonts`, then select tab `Manage Fonts` (sorry I have localized KDE, exact names could be different). 2. Select any font from list. Actual Results: Selected font preview not rendered correctly. Expected Results: Expecting to see selected font preview.
Duplicate, see #336089
(In reply to St Weiss from comment #1) > Duplicate, see #336089 Right, and it should be fixed since 5.5.4. *** This bug has been marked as a duplicate of bug 336089 ***