Hello @la.electrical@ya,

Unexpected problems in QuickBooks Online are sometimes affected by browser issues. This is because the cache will constantly overwrite itself without deleting the old stuff, causing the program to function poorly.

To check if this issue is caused by the large data in the cache, try using a private window and create an invoice there. This place prevents cookies from being stored on the computer, making it a great place to identify browser issues.

Use any of these keyboard shortcuts depending on the browser you're using:

Google Chrome: press Ctrl + Shift + N  
Mozilla Firefox: press Ctrl + Shift + P
Safari: press Command + Shift + N

If it works, clear the browser's cache to remove the history or log files so you can start with a clean slate.

Also, it is highly recommended to use a supported browser to avoid compatibility issues. See this article for the list: System requirements for QuickBooks Online, Accountant, and QuickBooks Self-Employed.

If the same issue happens, contact us immediately. Our representatives can create an investigation on what's causing this problem. Please note that our Support Team are available from 6:00 AM until 6:00 PM on weekdays, and 6:00 AM til 3:00 PM on Saturday.

You can also request a callback, so you won't have to wait on the line. Here's how: 

1. Sign in to your QBO account.
2. Click the (?) Help icon in the upper right-hand corner of the Dashboard.
3. From there, select the Contact Us button and enter your concern in the description box.
   
   
4. Once done, select Start a chat or Get a call option.

Feel free to come back anytime if you have other questions. I'm here if you need further assistance. Have a good one!