Thin client sessions connect from a workstation to a server; the program runs on the server, but the screens are seen on the workstation.
To accomplish this, there is a service on the server, called AcuRCL, which services requests from the workstations. In order to run Rx-Universe in thin-client, the AcuRCL service on the server must be correctly configured, and be running. This configuration is done automatically when Rx-Universe is installed from the dongle, but moving to a different computer or recovering from a catastrophic failure might require manual setup of ACURCL.
The program is called ACURCL.EXE and is located in the RxUniverse\RUN8 folder. Run the program, and go to the Services tab. You should see a screen similar to the following: