If you click on the console tab on the detail panel you can see all errors.
If the folders are read only that could well cause problem because sometimes we need to write changes to a temporary file so we can ensure the write was successful before replacing the original file, so try making the folders writeable.
Worst symptom being save failure notices thro files being in use and files being inaccessable - but simply re-saving cleared them and in just 1 case a third save attempt cleared them - so, I don’t quite understand the reason but it’s easily workable. Cheers.