We had upgraded our version of samstock from 4.80 to 4.9.1 and we have cleared our till of all the old plu files and then resent them across. The samevent to resend them across to the till seemed to work fine, as no error codes came up and it completed the action successfully. However when we have scanned in one of the barcodes on the till (ER-420M) as a sale it doesn't appear to recognise it. The incredible thing is that when you scan the same barcode into the till as a price enquiry it finds the file. It looks as if the information has been sent over as it has memory of it for the price enquiry, but there is something preventing it to be used for a sale transaction.
Something else we have noticed is that with the old version of Samstock 4.8 when we entered a barcode of three or four digits samstock 4.8 would automatically put zeros in front of the digits to make it up to a six digit number. Now on the new version of samstock version 4.9.1 is doesn't. Again amazingly when you search on the group product files since the upgrade some have zeros in front of the barcode number and some haven't, even though I haven't manually entered any zeros as a prefix myself?

I have been struggling to get this sorted out now for a while and I would be very grateful of any advice that anyone could offer.
Many thanks.