Hi, I updated to 2018 version (Accounts Premier)a while back. Since then, having restored from back up...it seems to possibly be a read-only file. I can do Invoices etc on it but it comes up with the following message box "The file you have specified cannot be opened. Make sure that it is not currently being used by another program or a read-only file. The windows error was 'The file exists'. " What on earth can I do to fix it?