This issue has been fixed by upgrading to MacOS Catalina . Various Illustrator users have confirmed that on upgrading their macOS issue is fixed.
Please comment on this thread, if this issue is fixed in Catalina (10.15.1)Donna E. commented
Hi - yes I have upgraded ro Catalina and the flashing hasn't happened at all since doing so.Donna E. commented
Hello - as an update to the above post I have a recording of this which can be found on this linkDonna E. shared this idea ·