Hi
There is a change in query engine so, CR will rewrite SQL while converting reports from 8.5 to CR2008.
As you said, for simple reports it is working fine and wherever more than 2 tables it is not working.. have you checked whether you hany any sub reports in that report ?
Also for Progress database try to download Data Direct Drivers from below location and install. Try to create a new ODBC connection with newly added driver and check,
Hope you are following below steps while convering :
--Close Preview
--Go in Database Menu--Set Datasource Location
--Change to new datasource and update
--Run report
Also open any report which is not working in Cr2008 go in Database menu and go in Show SQL qeury and check any sql statement added manually.
Thanks,
Sastry