You should try using the RDC instead. The integration technique you are using is no longer recommended nor updated by Crystal Decisions.
Having said that, I can't say if the RDC will solve your problem as it could be the ODBC driver itself that is showing the behavior.
>crystal 8.5 using the crystal.crystalreports class
Craig Berntson
MCSD, Microsoft .Net MVP, Grape City Community Influencer