We resolved this over chat, but I’m posting our solution here as well for the rest of the community 
This issue was a result of the 2 week free trial of Retool ending. After the trial expires, you can open your apps in the editor, but you need to select a plan before you can save changes to your queries. While we can preview unsaved changes, we cannot save and run the query changes until a plan is selected.
If you see the trial expired banner at the top of your screen, please select a plan to continue using and editing your apps. Even if you opt for the free plan, you’ll need to have an admin in your organization navigate to the billing page and select the plan you want to use.
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