Hi, Susan,
Thanks for the added information. This sounds like something that is specific to the 'steps/options used' by someone as it isn't occurring all of the time with your data either.
If there's anyway your people (user 2 and 3?) could take note as soon as the problem occurs of what exactly they did and then let us know it could help us and others to duplicate the issue for R&D.
If user 1 were to use user 2 or 3s w/s, do they experience the same issue while logged on as themselves (i.e. not as user 2 or 3)?
PO8.1C installs to a totally different folder (Softrak\PurchaseOrders) than PO8.1B does (Softrak\POWIN)so your original 8.1B install shouldn't be overwritten at all. You are not able to open the same dataset with both PO8.1B and PO8.1C at the same time with the shipping release of PO8.1C though. You are able to open the data with PO8.1B, close it, then open the same data with PO8.1C, close it, etc..
You indicate that the tax change is not saved. Would you elaborate? Where exactly wasn't it saved. I too edited the tax for the 2nd vendor (on the 2nd receipt for the PO) and changed it by 1 cent. The correct, adjusted amount was sent to both AP and GL. And, in PO, I see the correct information in the Data Flow and inquiry.
I will test this some more. As always, any more detail you can provide is appreciated.
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Regards,
Softrak Tech Support