So if you notice that something doesn't work after this moment (especially UDP, MMS streams), just change the web OS Video Mode in application settings, it will use the previous video mode.
As it's not supported in web OS natively, when you use alternative audio track, the app will select the old video mode to change the audio track.
Or just try another browser if it still doesn't work.
Previously selected channels are now shown by pressing "0" (also PRE-CH on Samsung) button or "previous channel" button using Magic Mouse.
You can set the timer by calling the channel schedule (EPG) and pressing the Red button (Set Timer), OK button or by clicking the programme name using Magic Mouse. You can now add DVB-T/C/S (digital only) channels on your TV. It's also possible to rescan the updated DVB channels list this way.