I had this problem too on a machine once but it was only for a few minutes, then everything worked well. Can you retry to see if the problem is still there?
Also try to enable service diagnostics to see if the PC Monitor Service is experiencing the same connection errors.
To enable Diagnostic Logging in the Manager -> Settings -> Diagnostics and then click on the Enable Diagnostic Logging. Wait until the service crashes then have a look in the logging file called trace.log inside PC Monitor's installation directory. If you find anything unusual please post here the log (after you remove any personal information).