Hi boroda74!
Using version 4.8.4919 of the Additional Tagging and Reporting Tools and version 2.1.4924 of MusicBee.
Yesterday I encountered a strange issue using the copy tag function as follows:
1.) Marked some mp3 files to be changed (copy title to empty album tag)
2.) Setup under copy tag: Copy from Title to Album Tag
3.) After Setup I clicked on the "Preview" button. Everything was fine. I usually don't use the preview function but yesterday I did because of a fresh clean installation of the 2.1 version (I was updating from 2.0 version) of MB and reinstallation of the 4.8.4919 version of your tagging tool.
4.) As everything was fine I clicked on the "Apply" button.
5.) Next thing I expected was that the album tag of all marked mp3 files were filled with the copied title tag but that wasn't the case obviously, i. e. I couldn't see anything being filled in in the album tag on my screen.
6.) So I marked one of those mp3 files, opened the tag editor and voilĂ the copied value was there in the album tag.
7.) Next I clicked on "Save" and - what a surprise - the album tag appeared on my screen (being visible now).
8.) Then I repeated steps 1 to 4 except using the preview function. I directly clicked on the "Apply" button.
9.) And now the album tag was filled and I could see it on my screen without using the tag editor detour.