If you're trying to create a new budget and the dropdown options in the Tiller add-on sidebar are stuck on "loading" it's because you're signed in to multiple Google Accounts in the same browser.
Ways to fix it:
- Log out of other Google Accounts (you can easily log out of other accounts through gmail).
- Create a separate browser profile for the Google Account you use with Tiller.
- Open the sheet in an incognito browser session and try creating the budget again.