Please post a screen shot of the DSN you are using as well as a screen shot from the properties tab of AdagioODBCv2.dll

The problem could be data related. You may want to connect to AP sample data to confirm your setup.

Here are the 2 screen Shots...

ODBC Properties

DNS

Hi Yann,
The ODBC Properties looks OK.
The DSN has * for the Table Selection, please change to AP81B* to minimize the tables returned to MSAccess

In an earlier screen shot of the Visual Connection Expert you show Red&Yellow pointer for the 3 keys from APTransactions_ap81btrn.
It is my understanding that these only were displayed for ODBC 8.5 and are not there ( at this time ) in ODBC 9.1

As noted, all of Yann's ODBC properties and DSN information was correct. The problem was tracked down to an issue with the shipping AdagioODBCv2.DLL (2.1.7.133) and is fixed with AdagioODBCv2.DLL (2.1.7.155) or greater which will ship with the next release.

Thanks Michael!