I've just released Mp3tag for Mac v1.9.8 with the following changes:
Changed & Improved
- Save toolbar button and menu item are now always enabled when files are selected. (#69782)
Fixed
- Added a workaround for an issue where toolbar symbols did not immediately update their enabled state on macOS 26 Tahoe when the File List selection was changed using the mouse.
You can update the Mac App Store version via the Update tab in the App Store app and the standalone version from within the app via File → Check for Updates .