When TSReader is active and you change to a scrambled channel the client freezes up.

This does not happen when using tsfilesource.
Instead a user friendly dialog appears, telling the user that the channel is scrambled and therefor not watchable.

although taskmanager is able to end the task.

This was reproduced on 2 different clients.

The card in question is a skystar2 dvb-s card with no built in CA interface.
So decryption is impossible.
Just to make this clear.

FTA channels etc. works just fine.

client/server Logs attached.