New to QB. Imported all customer invoices from sim pro for Dec and all showing except 1, which on sim pro it says it has been exported but its deff not there, any ideas?

Hello Leigh-teesdalere, 

Welcome to the Community page, 

Can you please clear your cache and cookies to all time, close the browser down, reload it and see if if it then shows up for you or not and get back to us thanks.