Created attachment 125498 [details] Screenshot Black squares appear in the input line instead of the numbers 4 and 9 (see attachement) Version: 5.1.3.2 (x64) Build-ID: 644e4637d1d8544fd9f56425bd6cec110e49301b CPU-Threads: 4; BS-Version: Windows 6.19; UI-Render: GL; Gebietsschema: de-DE (de_DE) Dieter
Hm, I can remember coming across a bug report with a similar font display issue (blocks instead of characters) a couple of days ago, but can't find it now.
Also, give it a try with OpenGL rendering unchecked. Tools -> Options -> View (e.g. Extras -> Optionen -> Ansicht).
This was the one I thought of: bug 94863. (also UNCONFIRMED, no useful extra information in the report) Actually, not much in common, even the black boxes are different, but both were reported on Windows 10. Also, that one wasn't OpenGL-related, so if this one disappears after disabling OpenGL, then they are certainly different issues. There's also this post from reddit: https://www.reddit.com/r/libreoffice/comments/4mt3yo/help_garbled_text_in_libre_calc/ That's on Windows 7.
Maybe you could also try with a fresh master build just to compare: http://dev-builds.libreoffice.org/daily/master/Win-x86_64@62-TDF/current/ Set to NEEDINFO. Change back to UNCONFIRMED after you have provided further testing results.
*** This bug has been marked as a duplicate of bug 100279 ***