When I click on the + to open a new tab, I get an error code. This worked before, did I do something wrong?

Welcome to the Community, @quanticfi2.

To check if this is a browser-related (cache and cookies) issue, try signing into your QuickBooks Online (QBO) using a private browser (incognito). There are times that the browser is already full of frequently accessed page resources, causing some unusual responses.

Here's how:

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

If it works, return to your default browser and perform a clear cache to refresh the system. However, if the issue persists, try using other supported browsers.

For tips and other resources, I recommend visiting our website for reference: Self-help articles.

Feel free to leave a comment below if you have any other concerns. I'm more than willing to help. Have a good one!