Mine is doing this as well however it isn't just Invoices not being sent, it is Quote's (Estimate's) as well. This is ridiculous. You can't run a business when you can't send them through a Quote or Invoice that is Required.

The only solution QuickBooks Support can suggest is to try editing or replacing your email in the account settings - this does not work. I have tried different browsers - Internet Explorer and Google Chrome which makes no difference, they are still not being sent.

The customer service number you have to call can not be called from Australia and the number that I used to be able to call from Australia has been disconnected and replaced with a message to call the American number that as I said doesn't work. This is incredibly frustrating and starting to be infuriating! I'm just trying to run a business and make a living.