do a 'sho mod csm X vserver name detail' and verify if there is any hit on your content rule.
Check that the server packets counter is increasing.
If you have no hits, make sure traffic comes into the CSM - capture a sniffer trace.
Make sure it gets to the CSM on the correct vlan.
If there is no server packets, make sure the gateway on the server is pointing at the CSM.
A good sniffer trace on CSM portchannel is always helpful to understand what is going on.
Gilles.