MultiTerm 20xx does not start on Windows terminal server (error in hrresult)

Hi community

Up to now I have never managed to install MultiTerm Desktop on a Windows Terminal Server (2008R2) in a way that it can be started and used by the domain users. Sometimes it works, e.g. after restart of the server. But the next, different user will again get the error in hrresult and MultiTerm will not start. With Studio there is no problem on terminal server/remote desktop. We use networking licenses.

Thanks for any hint.