If you get yellow text 'No Traps' in FM client means that the FM has not registered trap address on this switch successfully and hence not receiving traps from those switches. It may be that the trap address table is full (max is 10 entries) on the switch. If table is full, then delete any stale/unused addresses in the switch. The FMS's next periodic poll will add it's trap address to the switch and the 'No Traps' warning will go away after this. Try
refreshing the Switch table in the FM client to see an updated status.
And also check the Switches remain manageable even when "No Traps" is displayed. Then you are hitting bug CSCta72679. To workaround this Rediscovering the Fabric will change the status back to "ok" but this is only a temporary solution.