Did you close and reopen the contact sheet and then check for your changes?
-Kirk
Now I have the error again but what can cause this and how can this be overcame? I seem to have it only with RAW files (CR2 in my case).
Now I have a workaround since I first extract the embedded JPG and then usually open a combined contact sheet to have all modifications (especially the crops that are otherwise not synchronized) in both versions.
So I discovered the error only comes up with the RAW files. Thus I made the IPTC change on the JPG files and update it in the RAW.
But this still does not solve the initial problem there is something happening to my files that disables editing their IPTC data. And numbers show the error disrupts the process so the first file uneditable seems to cancel the process so not any files get the new imput when the first error is encountered.
I never met this issue before the latest version of PM. And it greatly concerns me.
It would be great to have a method to discover:
a. what causes the error
b. which files are affected
c. how to solve the issue