Hi
My first post.
I did look to see if it is has been reported but could not find any.... why does it happen to me, hate computers...
Running on Vista with Mp3tag v2.69
I know I can work around it, but can someone check that it is not just my PC / or me. 
I bought a set of 13 DVD talking books LOTR, the PC RIP made a mess so it needs fixing.
I have screen shots if needed. Not attached at present.
Please can someone try this test
1/ create a top level directory with say 3 sub directories (mine is 13 subs with about 6 mp3s in each)
2/ put a bunch of MP3s in each subdirectory
3/ use Mp3tag and load up the top level directory
4/ use convert tags and change ALL title = filename and artist to something
5/ should look ok in Mp3tag, not a problem
6/ check the properties of the second subdirectory first file and the tags are blank
7/ first subdirectory OK but all others missing tags on first file
The way I did it was to
I used explorer search for *.mp3 and add columns to the display.
Looks like a code LOOP problem to me
I will be back on Tuesday 5th May.
Always loved the software, but don't use it much (I seem to think it was nearly 10years ago I first used it)
Thanks
John