I have several web maps and apps on ArcGIS Online. Recently I am getting an error when loading them on Google Chrome. "The layer X cannot be added to the map".
To test that it was browser related, I was able to run the apps on FireFox and Microsoft Edge successfully with no error.
I've seen some similar posts from 2016 where the fix was to upgrade Google Chrome. I did that. Running Version 72.0.3626.96 (Official Build) (64-bit).
After I posted this, I found that clearing the cache is a fix. If this continues, I'll be back here...