ODBC connection problem with 3.60

Hi All, I have a weird problem. One of our clients is using Navision Financials 2.60. He created an ACCESS database connection with Navision, by using a 2.60 ODBC driver, to pull data from Navision. It worked fine until he recently installed 3.60 Attain executables with the 3.60 ODBC driver (and still running his 2.60 Financials database). The problem he has is the way decimal fields are being transferred by ODBC. They are no longer decimals but text-fields. Please advise. Thanks, Roelof