ISSUE #1:
Then closed MC on the laptop and went to the living room on one of the other 2 PC and connected as a client to the main HTPC...Unable to watch the game getting "no card available to fulfill the request..."
Did you try to play the in progress recording, or just watch the TV channel?
Because you should have watched the in progress recording. I think that would have worked.
If you tried to watch the TV channel that the game was playing on, the MC Client would have asked the MC Server to start the channel on a new tuner, I believe. Maybe MC should check if the Server is already playing or recording that channel, and just show you that stream, but I suspect there would be issues with that, around ownership and control of the stream.
Regardless, playing the recording should have worked.
ISSUE#2:
Another issue I keep getting (MC21-22) is I get BOTH TV recordings showing up in the TV recordings list when I connect from one of the 2 slave PCs on the main HTPC. I always close the server on those 2PCs before connecting to the main HTPC and I get the same issue on both.
I suspect that is a consequence of the way you use MC, with tuners on the Server and the Clients. There is only one installation of MC on the "Slave" PC, so you can get some strange results, as you know. I can't remember or check just now where the TV recordings list is stored. Check that out and see if it is in a location shared by both the Server version and Client version on the Slave PC.