well I went through a conversion to 4.5.2 and it completely hosed the data for that company. My fault probably - I killed the conversion because it was looking for credit card data and it was taking forever. When I killed it completely hosed my data in that company. Seems odd! This is a huge dataset 10 gigs. I will reconvert from providex soon and try again. I am interested too in the locking. My bet it will be the same if I am in an inventory item it will pause until I exit.