Whilst path creation undo sometimes is not possible. It appears whilst using the plugin SuperTool. Is there a reason why this happens?
That is a known problem. If you can reproduce it, I can fix that case.
It is mostly caused by some scripts or plugins that donāt handle changes to the font correctly. So if you can narrow it down to a certain function or script ā¦
Alright, thank you for your reply Georg. If it occurs again Iāll look if I can narrow it down for you. 
It looks like itās occurring after the Mac fall in āslumberā mode and wakes up again.
then again,ā¦ shootā¦ it isnāt. Just occurred after a scaling command.
The problem might be cause several steps before you invoked it. That makes it quite difficult to debug.
Ah ok, I understand. Iāll try to pay more attention to my actions.
Iāve filmed it. It now occurs whilst dragging tangents around. Iām only using a mouse and using cmd+z to undo.
undo glyphs.mov.zip (4.3 MB)
What version of Glyphs is this?
Can can you hold down the Option and Shift key while starting Glyphs to disable plugins?
itās version 3.2 (3227).
Iāll try the option you suggested. Thank you.
Ayn reason you are not on the latest version?
well because it says it is running the latest version. 
I didnāt read the text but it seems my version is confused, like I am.
Go to Preferences > Updates and check āShow cutting edge versionsā.
Ah, thank you. I have now 3.2 (3241) running. Iāll check if the problem occurs again.
This morning I tried Georgās suggestion: starting Glyphs without plugins. The problem didnāt occur during this time.
If you get the problem again when you run with plugins then it most likely a plugin that is causing this. To find the culprit, remove half of the plugins, restart Glyphs, see if it crashes. If not, the problematic plugins is in the removed group. As long as it still crashes, remove half, if not, switch back the ones you just removed. Repeat that until you have narrowed it down to one or two.
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Will try, thanks.
It seems to occur only in SuperTool mode (U).
Did you send all crash reports with the dialog that shows up when you restart the app? And add a note pointing to this thread.
Can you reproduce it?
What version of Glyphs do you have?
Hi Georg, the app doesnāt crash it just shows the message. When I click āokā I can continue working but canāt undo before the message appeared. So there arenāt any crash reports.
I running version 3251 at the moment. SuperTool has been downloaded again and installed last weekend via the plugin manager in Glyphs.