Hey there, @brevityandwit.
Thanks for following the thread.
To clarify, did you close your browser once you cleared the cache and open it again? If so, I recommend clearing Intuit-specific cookies from Chrome. This will help to refresh the preferences that might be causing problems when using QuickBooks Online. Below I've included the steps to do this.
1. Click the Menu : button.
2. Choose Settings.

3. Scroll down, under Privacy and Security, click Site Settings.

4. Select Cookies and site data.

5. Pick See all cookies and site data.

6. Type Intuit in the search bar.

7. Click Remove all.

8. Restart Chrome for the changes to take effect.
You can see, Clear cache and cookies to fix issues when using QuickBooks Online for more details.
Please let me know if you need further help. I'll be here to guide you every step of the way. You can always reach out to us here in the Community, and we will be happy to get you back to business. Enjoy your weekend ahead!