So you both have fontlab installed? Can you compress FL into a .zip and delete the app itself (not the .zip). Then run this command and restart:
/System/Library/Frameworks/CoreServices.framework/Versions/A/Frameworks/LaunchServices.framework/Versions/A/Support/lsregister -delete -seed -r
Zipped FL, trashed app, ran Terminal, restarted.
All good 
Unzipped FL. It now says itâs damaged 
Reinstalled FL
Back to same pop up problem.
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Jeremy: Yes. Aaargh! Didnât see this coming. I also lost access to a faithful old printer.
Georg: Perhaps this is a clue: my popup is slightly different from Jeremyâs. In mine, it says: Do you want all documents with the extension â.designspaceâ to open with âcom.GeorgSeifert.Glyphs2â or to keep using âFontGogglesâ?
So perhaps FL is not really the issue?
The fact that it says âGlyphs2â baffles me, but might be a clue? Could this be a FontLab issue? I also have FontLab 9 installed, but (thanks to Jeremy and his tale of woes), I have not installed Tahoeâand wonât, until this gets sorted!
Iâm trying to recreate the problem (setting up some virtual machines âŚ).
My MacBook is an Apple M1 running macOS 26.4
My Desktop is a Mac Mini M2 running macOS 26.4
I didnât have this problem on the previous macOS 26.3XXX (just the dodgy interface)
I found the problem and fixed it. Sorry that it took so long.
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Brilliant Georg
Thank you, Georg!
Hi @GeorgSeifert â I have just experience a bit of a bump with this too and all of a sudden I cannot open Glyphs on Tahoe 26.4.1. I installed a cutting-edge version this morning and it was all working until now. Any ideas how can I sort it out?
report.txt (94.1 KB)
The Plugin Manager had a new, invalid entry that slipped through. Should work now.
Fab, thanks @GeorgSeifert