Every so often I open an invoice from the sales register to print. That's all I do is print it and not make any changes. When I try to close the invoice window, I'll get a message that says another user has made changes, do you want to save the changes. I'm the administrator and only user on the account. Any ideas why this message pops up?

When you open an invoice and print it, you flag it as 'Already Printed/Sent' and this will do the change as a system user. When you are closing it, this is why you are getting the message.

Easiest way to not get the message? Click on Cancel when getting out of the invoice.