Missing font for Rstudio?

[cschwarz-stat-sfu-ca]

Running Rstudio Version 2025.09.1+401 (2025.09.1+401) on Mac Intel chip running Tahoe 26.0.1 (25A362).

When I launch Rstudio, the splash screen has question marks (?) all over it.

Similarly, in the Find/Replace menu, the "Find" etc are replaced by question marks.

Question marks also appear in many other places i.e. Tool -> GlobalOptions -> Appearance.

I'm guessing that this is a missing font problem, but which font is missing/damaged that I can try and re-install?

I've tried re-iinstalling RStudio, resetting RStudio, restarting, etc but to no avail.

Thanks
Carl Schwarz
cschwarz.stat.sfu.ca@gmail.com

[cschwarz-stat-sfu-ca]

Update.. I went to FontBook and used FontBook -> Settings -> Advanced and clicked on "Reset Fonts". This cleared out about 1/3 of fonts in the font library and resolved the problem. Not sure which font was causing the problem though.

Carl.

[GaryR]

Quite a few people have hit this with macOS Tahoe, more at: Quarto table preview text not rendering in new macOS 26 · Issue #16237 · rstudio/rstudio · GitHub