Well, given that it is working for me, and many other users, it has to be something about your system.
I don't normally recommend uninstalling stuff to try and fix problems, but I think you are going to have to make perfectly sure that neither antivirus, firewall, or malware software is blocking the transmission of the TV stream over your network. It is quite possible that the version of the decoder codec in 20.0.115 and below is correctly registered with such software, but a new version as of 20.0.118 is not. I have seen that before.
As TV works on the Client when the Server is running 20.0.115, I recommend that your next step is to completely uninstall all the above types of software, just for the test period, on your Server. You will need to reboot the PC several times I assume in doing so, but make sure you have a clean boot before starting testing. Also, check under Control Panel\System and Security\Action Center (windows 7) to be sure that no antivirus, firewall, or malware software has been restarted by Windows, as it has a nasty habit of doing so when you uninstall existing software.
EDIT: I think it would be a very good idea to reinstall MC 20.0.132 over the top of your existing installation, in Administrator mode, after you have all the above software uninstalled, and have done a clean reboot. That may allow some components to be correctly registered in Windows, which may have been blocked previously. In fact, just doing this may fix the overall problem, and allow you to reinstall all security software without the issue returning. But test one piece of security software at a time anyway, as below.
If you are willing to do that, you may be able to isolate the problem to one of the security software applications you usually use, by reinstalling one at a time and checking when the TV streaming to a Client stops working. Then you may be able to find something in the logs of the software causing the problem, or in the Windows Event Viewer, to isolate the problem. At worst, if you identify software causing the problem, you can start discussing setup with other users who use it with MC.
Let us know how you go with that, if you decide to go ahead.