Apologies for the inconvenience caused to you due to this issue.
Unfortunately we are not able to reproduce this issue. Could you kindly provide the following information to help us nail this down.
1)Kindly try the below workaround and let us know if that helps with the issue:
Kindly rename your Preferences folder placed in below location and share this folder with us in a zip file.
MAC: /Users//Library/Preferences/Adobe Illustrator 24 Settings//
WIN: C:\Users\\AppData\Roaming\Adobe\Adobe Illustrator 24 Settings\
Kindly share the above with us in a Zip file at ShareWithAI@adobe.com
Please mention the title of this issue as the subject of the mail.
An error occurred while saving the commentHans commented
Here is what worked for me. Open Illustrator, but not a file. Go to Window > Workspace and switch to a workspace (i chose classic). It seemed to unstick something. I closed illustrator, and when I went back to an illustration i was working on this week, it opened with the classic workspace. Hopefully, that sticks. This is not a bug I expect from Adobe...