I used version 2274 for a large number of auto-tagging and it worked fine. I selected folders with sub-folders to auto-tag via context-menu (right-click on a folder at local disc).
At some point (I can't explain when) it didn't worked any more. When I choose now a folder with sub-folders the auto-tag dialog opens but remains empty

(just the general auto-tag text at top and buttons at the bottom). I can still start auto-tagging every single sub-folder which directly contains the mp3-files, but tis way is very in-efficient and I purchased Gold license for this feature.
Additionally the column width is always over-large. This way it's hard to work. I found no way to store the view settings. I have to reset it every time opening the auto-tag dialog.
Changing to version 2276 did not solve the problem. Therefore (next issue

) I cannot re-enable the "Prefer faster media lookups..." in options dialog after disabling once. Even unistalling und reinstalling complete MM5 software did not help.
Many thanks for some advices or workarounds to solve these issues!
Stefan
