Thanks for reaching dropping by the Community, @HAM9000.

There are times that the browser is full of frequently accessed page resources, causing some unusual responses. To isolate this, try logging into your QuickBooks Online (QBO) account using a private browser (incognito).

Here's how:

• Press Ctrl + Shift + N (Google Chrome).
• Ctrl + Shift + P (Firefox).
• Control + Option + P (Safari).

Once signed in, go back to the Sales menu to double-check.

If it works, return to your default browser and perform a clear cache. Every so often the cache becomes overwhelmed with older data which can potentially cause viewing and performance issues. Clearing it will refresh the system, and you'll be able to work with a clean slate. However, if the issue persists, try using other supported browsers.

Please know that I'm only a few clicks away if you have any other issues or concerns. I'm always here to help. Enjoy the rest of the day!

Nothing worked. Issue persists. See attached screenshot of sample company in which invoice tab exists.

Thanks for informing us how the troubleshooting wen through, HAM9000.

In this case, our customer support will take a closer look at this to determine why the Invoice tab is missing. 

Here's how you can reach out to them:

1. Click the Help menu and click Contact Us.
2. Let them know that the Invoice tab is missing in the Sales menu, then click Let's talk.
3. Click Chat or Email us.

Please take note that our Chat Support Team is open from Monday to Friday, in between 9 AM to 6 PM (GMT +8). 

Visit us again in the Community if you need anything else. 

Click chat is never an available option and Email us is greyed out and shows unavailable in grey. 

Hello there, HAM9000,

I can see that you have a similar post. My colleague Jen_D has already answered it for you. You can check her response here: https://quickbooks.intuit.com/learn-support/global/manage-customers-and-income/re-custom-invoices-ca....

If you have other questions that needs to be addressed, you can always leave a reply here.

He/She has not answered correctly!