There was a problem adding this invoice. Unable to edit. Problem persists. How do I get help

I'm here to lend a hand, @millershandymans.

For me to provide the best resolution for you, can you please verify what are you trying to add to invoice?

There are times that your default browser is filled with data and temporary files from previously visited websites. When QuickBooks Online has unexpected behavior, it is recommended to use a private browser. Doing so helps isolate the issue. You can use the keyboard shortcuts below:

• Chrome: Ctrl+Shift+N
• Internet Explorer: Ctrl+Shift+P
• Firefox: Ctrl+Shift+
• Safari: Command+Shift+N

Once you've opened a private browser, try to add it again to your invoice. If it works, to ensure this doesn't happen again, it's a good idea to clear the cache of the browser you're using or trying other supported browsers. 

You can get back to me anytime you have additional questions in QuickBooks by posting your response below. I'll do whatever it takes to ensure your concerns are addressed. Have a great day.