Hi @TPFLegionaire The most probably i have found a solution. Today it appeared, that it works without setting the source choice in TV. The android switches it itself. Probably when you first switch the source of the signal, the phone gives the TV some incomprehensive instruction in this context, and both become stupid. First I made once more trial, I set the TV IP adress as static instead of dynamic. This gave rather nothing. I haven't tried run again YouTube from TV, I would be astonished if it works now, but it is not the key problem yet. But the last problem which I mentioned yet is the loging in to the Medion Community. The procedure is as follows: I get new password form MEDION Customer Service, I log in, it works, then I change this automatic password to mine, the system accepts it, next time I try to login with new password and I've got a message (in polish) meaning approximately: Your entered data are not reliable to login, so I again require new password and so on. Now I haven't changed the automatic password to mine one, will see if next time it'll be valid. I don't know if you are able to do anything with this, anyway you deserve the Kudo, thanks a lot.
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