Yep, It's very bothersome to be tangled inside the font issue. Actually, I find out the cause.
My pharo folders with images and sandstone files are synced with cloud (synology NAS) in order to allow update at my different work places. I found that if I triggered image saving several times too quickly, the updates get trouble inside what the image was saved, maybe the font files were lost or conflicted as a result and error occured while reopen that image. I quitted the cloud synchronize and the errors resolved. Best regards. -- Sent from: http://forum.world.st/Pharo-Smalltalk-Users-f1310670.html