I’m a bit confused about the new “Manage Covers” implementation.
It says in the release notes that you can access it via Ctrl+Shift+M, but Mp3tag suggests to use Ctrl+Alt+M. Neither of these work for me.
It should be CtrlAltM if you've selected files in the File List and are using the keyboard shortcut from there.
The keyboard shortcuts are not available from the extended tags dialog, and I'll see to remove them from the menu that's displayed there with a future release.