DB connection error help

[mcclainj]

I installed birt 2.3.1 on ganymede. I place ojdbc14.jar in the org.eclipse.birt.report.data.oda.jdbc_2.3.1.v20080827 plugin directory so that my jdbc driver would be visible to the report designer. All started out well - it opens up and works fine.

I created a test report in the report designer having 2 fields.
The query preview works - it returns results. However, when I try to preview the report, the preview screen returns

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Cannot open the connection for the driver:
org.eclipse.birt.report.data.oda.jdbc. There is an error in get connection, invalid arguments in call
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If there were invalid arguments, why does the query preview return a result set? Is the viewer getting its connection from a different place than where the datasource and dataset get their connections?