Write error on m4a and a feature request

Hello,
All my files are writable, can be deleted and have no permission issues, nor are they locked. Tagging is working fine for all files except mp4 (m4a). Every time I try and tag one of these I get fail to open for writing error.

There isn't anything wrong with the files, other than being m4a, all other formats are fine. Any idea?

Also, I've just clicked close by mistake thinking it was my browser after doing a preview and it's now going to take another hour or so to go through all my songs again. Any chance of getting 'are you sure' option in the next version....

Thanks.

some mp4 files are equipped with digital right management ... so perhaps that forbids the modification.

Thanks, they were corrupted :slight_smile:

Now, onto that prompt when exiting message......