Just standard MAS200 (Advanced) No mods/Avatax, etc. I actually own this company. Staff has been there for years. It could be a user issue, but it would be coincidental as it started right after we upgraded. At first I thought it was happening when an invoice was being created, but then I was able to catch one and look at the sales order.
Strange thing - they accept the order, print the pick ticket - which is actually a modified sales order in this case - and the pick ticket is correct but when you go back into the order, the ship to had changed back to the address on the default ship-to. Stranger - we cannot recreate it and it happens haphazardly.
They were on 4.5 for quite some time and never had the issue and our procedure had not changed. We did implement Sage Payment Services when we upgraded to 2013.
Sage has not had this reported by anyone else.