When i ask to customise my invoice to raise first ever invoice it goes to a white screen and despite waiting 15 minutes and refreshing nothing happens?

Hello waylisbramble, Welcome to the Community 👋, Whereabouts are you doing the customisation from? are you doing it from the invoice and select customise at the bottom or are you in custom form styles? 

It may be that you need to clear your cache and cookies, Could you clear your cache and try again and let me know if you get the same issue? Thanks