We have tried to fix the issue in the current release. Please update Illustrator using Adobe Creative Cloud application to the latest build for version Illustrator CC 22.1.
Please refer to our knowledge base FAQ – https://illustrator.uservoice.com/knowledgebase/articles/1844590 if you face difficulty in the update.
Ashutosh Chaturvedi | Sr. Quality Engineering Manager – Illustrator
Adobe. Make It an Experience.
PS: We are only referring to the issue that got introduced in CC 2018. As I can see there were few workflows that were existing even in older releases. Please log a separate request for it so that we all can track it better
An error occurred while saving the commentValdemar commented
In my case there were some masked bitmap images that were overlapping from one artboard to another.
Because they were masked I couldn't be aware of the overlapping.
The warning message was not of much help.
The solution I found was to create a bigger artboard and cut and paste the content there.
Then I re-positioned the existing arboards so the objects in it never overlap.