Awhile back I tried using the external tool option and a new connection got created in the left hand side window labeled "PuTTY Saved Sessions". I am unable to delete/remove this connection.
Troubleshooting Steps Attempted:
1. Right Click to delete = all options are grayed out
2. Complete reinstall of mRemoteNG with removal of Roaming and Local files= no dice
3. Editing of confConfig.xml file= I was unable to find a connection named PuTTY Saved Sessions.