it seems to work now. I have enabled PS in TV-Server only. But now I have another problem - watching trailers via onlinevideos, my HTPC will suspend. So - how could I configure PS to only standby when MP is in Home Screen?
Thanks to your report we are now considering how we can make this more clear, and possible disable the option you had enabled for singleseat configurations. The should only be used (and available) in multiseat configurations.