Could you tru the following?
Clear your browser cache
Run sudo apt-get install fontconfig to ensure font healthcheck run w/o problems
Run sudo apt-get remove fonts-lyx on the server to remove problematic fonts
Run sudo apt-get install gsfonts gsfonts-other fonts-dejavu fonts-dejavu-core fonts-dejavu-extra libmotif-common to install / update required fonts
Run fc-cache -s on the server to update the fonts cache
Clear the plugins cache (restart required)
Rebuild the content indexes from scratch (restart required)
You are welcome :)
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