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I'm here to help you send the invoices,office214.
There are times that your browser is full of frequently-accessed page resources that cause QuickBooks Online (QBO) to act unusual behavior.
You can log in to your QBO account using a private browser to rule out cache-related issues.
Here are the keyboard shortcuts:
If it works, clear your browser's cache to speed up the loading process of the QBO website and for the system to start fresh.
You can also try switching to a different browser. Once done, you can go ahead and try sending the invoice.
For your future reference, you can read these helpful articles for more information.
Please get back to us if you need anything else. I'm always around to help you anytime.