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Hi there, john19.
This error might be caused by a browser-related issue. We have a few basic troubleshooting steps that you can perform.
First, open your QuickBooks company in an incognito window or private browser.
Here are the keyboard shortcuts:
Then, try saving your invoice again. If it's successful, let's clear your regular browser's cache and close it entirely. This will reset the browser settings back to default.
Once done, re-open your regular browser and try saving the invoice. If you get the same result, we can add QuickBooks as a trusted site.
Alternatively, you can try using a different browser such as Internet Explorer or Firefox.
If you have any additional questions or concerns about QuickBooks, please let me know. Thanks.