Thanks for reporting the issue . Unfortunately we are not able to reproduce this issue. Could you kindly provide the following information to help us nail this down :
1. Machine details which can be found by :WIN : Go to settings and Click on System and Click on About . In Windows Specifications , machine details can be found .
MAC : Choose Apple menu > About This Mac.
2. Version of Illustrator .
3.Kindly rename your Preferences folder placed in below location and share this folder with us .
MAC: /Users//Library/Preferences/Adobe Illustrator Settings//
WIN: C:\Users\\AppData\Roaming\Adobe\Adobe Illustrator Settings\
Kindly share the above with us in a Zip file at firstname.lastname@example.org. Please mention the title of this issue as the subject of the mail.
An error occurred while saving the commentPJ CG commented
I've encountered the same problem, only to find the input method on my keyboard was set to another language.
It was simply using another character.