Netflow Analyzer : Not reflecting data under UTILIZATION tab

Dear All.,

I have been testing Netflow in a test bed analyszer and production environment and currently i am facing 3 problems.

1) Flows are seen againist fw WeAN interfaces and can be seen in and out under SPEED and VOLUME tabs but no data or graph is reflecting under "UTILIZATION GRAPH" pls advise.

2) On few WAN interfaces eigher IN or OUT flows are seen after enabling flow ingress/egress under perticular interfaces.

3)On few WAN interfaces neither IN nor OUT flows are seen.

"Below is the config parameter across all devices"
ip cef
ip route-cache
ip flow-export version 5
ip flow-export destination <ip > 9996
underinterfaces:
ip route-cache flow
ip flow ingress
ip flow eggress
: All devices are netflow compatible"
can some on answere these.
Advance thanks.

Regards,
Ven