In the last version I notice when I change the tag and after that the filename in MP3Tag, the filename is not changed in the explorer of Windows. When I go back to MP3Tag I see that indeed the filename is not changed. The priblem is: it is not always, but most of the times.
Who knows what is wrong?
How do you change the filename?
Plainly, I think this is no general Mp3tag problem but one that has to do with your environment.
How do you modify the filename?
What does your workflow look like?
Do you get an error message?
Are you the owner of the files? (Check in Windows Explorer - it is sometimes not enough to be Administrator on a PC)