Not showing all routers in the 'Set SNMP' menu

Not showing all routers in the 'Set SNMP' menu

Hello
 
We have Netflow Analyser 8 Professional running and we have SNMP access to all our routers.
 
When I try to get Netflow to retrieve the interface descirptions via the  ' Set SNMP' option, it doesn't show all the routers in the list.
 
However it does know about all the routers as they all show up in the All devices list but some of them without the interface desciptions.
 
I have tried to run the SNMP retrieve for all routers but this doesn't work either.
 
We have checked that the routers not showing does have the correct snmp community and acl set.
 
Does anyone have any ideas why this is happening and how i can fix it.
 
many thanks for any help
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