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Hello there, @thegrubbs.
To isolate this unexpected behavior, let's use a private window to make sure that you can create an invoice or receive payment.
Here are the keyboard shortcuts:
Then you'll have to clear your regular browser cache. This way, it'll remove outdated files that may cause small issues.
Also, you'll have to check and turn off the pop-up blockers to disable any pop-up.
Don't hesitate to leave a comment below if you have any other questions. I'll be right here to help.