Your last post got me to thinking... I modified the service login to run in my user account instead of the local system - things seem to be working normally.
Thanks

I installed it using the Media Sharing (UPnP/DNLA) function in Library under Options. I am running 4.1.23.1881. In properties of the Mediamonkey Service, it shows the login in the Local Systems Account with the the "Allow Service to interact with desktop" function enabled. This service use...

When the Mediamonkey client is running I am able to stream the library content to UPnP devices. When the client shuts down, the Mediamonkey streaming service starts and runs, however, none of the devices can see the service.