Importing the file again will remove clips and split lines.
To avoid issues, quit Audacity, open Finder, Go > Go to Folder, and type:
~/Library/Application Support/audacity/
Delete the “audacity.cfg” file you see there. That will give you fresh settings to start from.
Trash the Audacity version you have now, obtain Audacity from Audacity ® | Download for Mac OS and read Installation: Do NOT run Audacity from the DMG!!!! for how to install Audacity.
If you have more questions at any time please give us the information from the pink panel at the top of the page.
Gale