Mark,
I believe Switchport mapper uses a RO string. I use that product at many of my customer locations and it works great.
The enable traps line is unneeded for what you are trying to use.
no snmp-server community teststring RW snmp-server community teststring RO
Another thing obviously is to make sure the solarwinds machine has connectivuty to the switch. A simple ping from the station will verify that.
-Brian