Access to Customer setup and tracker denied

Hi All, We are running V8.00.809d and have come accross something
quite strange. We have had 2 seperate users on 2 seperate occasions
where the user has had full access to the Customer entry form and the
Customer Tracker. Now they have lost access to the data in these
forms. Both forms can be opened, but as soon as the Cust ID is
entered, an error appears saying 'you do not have permissions to this
record'. The full error has been pasted below.

Exception caught in: Epicor.Mfg.BO.Customer

Error Detail
============
Message: You do not have permissions to this record.
Type: Error
Program: bo/Customer.p
Method: customerAfterGetRows
Table: Customer
Row:
Field:



Stack Trace
===========
at Epicor.Mfg.Proxy.CustomerImpl.GetByCustID(String custID)
at Epicor.Mfg.BO.Customer.Epicor.Mfg.IF.ICustomer.GetByCustID
(String )
at Epicor.Mfg.UI.Adapters.CustomerAdapter.GetByCustID(String
custID)
at Epicor.Mfg.UI.App.CustomerEntry.Transaction.GetCustomerData
(String custNum)

Has anyone else had this problem?

Thanks,
Jason Abramczyk
Precision Parts