Doubt this will help you but....
We are running VPC's as well and no, SolarWinds doesn't recognize those virtual ports. From what I know, Cisco is starting to move away from the snmp and move toward xml which SolarWinds doesn't tap into yet and don't know if they even can.
If I am incorrect, I have no doubt some one will offer additional advice.
Do you see one active endpoint connection or none at all? We see only one for either LACP or network fault tolerant active/passive nics.
+1 to see Solarwinds figure out how to reconcile UDT and redundant endpoint connections.