ClamAV vs ClamAV

I have two SuSE 9 systems, one 9.0 running ClamAV 0.67 downloaded from clamav site and invoked via the anomy filter. The other is a 9.1 system using ClamAV 0.70 downloaded from SuSE and invoked via Amavis (also from SuSE site). Both are using identical clamAV databases but the 9.0 system traps the Worm.Gibe.F virus infested emails while the 9.1 system does not! What could cause this anomaly and what should be done about it? (I used old quarantined emails to do the testing.) Thank you, Lucky Leavell