For completeness, no-one suggested resetting preferences. It seems to have worked for one user in another topic Deleting the preferences file for audacity on the mac . I wouldn’t expect it to work in your case given you have already checked sample rates and formats.
However for anyone who wants to reset preferences on Mac:
- Audacity > Quit Audacity.
- Open Finder, Go > Go to Folder and type:
~/Library/Application Support/audacity/
- Open audacity.cfg in Textedit or other text editor.
- Select all the content of audacity.cfg then delete that content.
- Select and copy the following text, then paste it at the top of audacity.cfg:
NewPrefsInitialized=1
- Save audacity.cfg and start Audacity.
Gale