Thanks for your question. I have not seen any issue like this before.
You wrote “there are some where the date field is readonly“. I assume you are referring to the WordPress “Uploaded date” field. There are several places where this field appears. To investigate further I’d like to get more information. Are you using:
- The Media/Assistant Quick Edit area?
- The Media/Assistant Bulk Edit area?
- The Media/Edit Media admin screen “Save” area?
For the affected files, are all three places not working? On the “Edit Media” screen, does the “Edit” link show up at all, show up but not work, or do the changes just not take effect? Are you using any other plugins that might also affect these places?
Any additional details you can provide will be helpful. Thanks for your help and your interest in the plugin.