The data couldn't be read (?)

What does this mean? 3207, 3208


When you open a glyphs file?
Can you check if it is a valid plist file?

This happens when I start Glyphs. I don’t even need to open a file, it’s the first thing that pops up.

I’ll see whether it stems from a specific plugin.

May be related to unsaved documents or the saved application state. See the Crashes tutorial.