From the release notes:
4. If you are using agents for probing, restart the agent service on the remote machine manually.
a. Wait for the plugin to update. This might take up to 5 minutes.
To verify that the update is complete, go to the Manage Agents page in Orion, select More actions > View installed agent plugins. The agent plugin version should be 1.0.30214.0.
b. Log in to the remote computer with the agent installed, and restart the SolarWinds Agent Service to have the plugin update applied.
Really? I have about 500 agents and can't even login to most of them.