Quote - Ok, this is weird, but those whose P7 serial numbers that don't seem to be working, have you tried ticking the "save this serial number with my account" box? You may already have saved it at a previous time ( I certainly had), but my P7 serial number refused to work until I ticked the box.

Strange, but true

 
Wish I had read your post earlier . Ticked that box last time , never had a problem until I did . Working fine now , so Thanks .