Is your data source set to query OnLoad? Or if not, have you manually queried the data source? Without an initial query you will have no values to display. Or, if the query returns no results, that will be the case too.

Signature
Greg Collins [InfoPath MVP]
Visit http://www.BrainTrove.com
Visit http://www.InfoPathDev.com
Dear All,
I'm trying to populate list box with values from access database. I'm
filling value and display name fields but the list box is blank in any case.
Where may be the problem?