Hi @braddownie,
Sorry for the trouble you are experiencing. You are exactly correct that odrive tries to protect against logging in as a different user to prevent a sync nightmare. 
Do you see an item in the odrive menu (in the MacOS menu bar) that says “Authorized User”? If so, try clicking on “Deauthorize” there to prompt odrive to log you in as a different user.
If that doesn’t work you can try a complete uninstall using these instructions here: How do I uninstall odrive?