This is not just Vaders.
As they are down yet again, I am using my backup cheap-o service and the function is similar.
Seems to happen more with the regionals, I think but could be wrong about that. Anyway, select the channel from the guide and the stream either does not change while putting the tv icon on the newly selected channel or spins on a black screen for a bit and then returns to the previous channel. However, if you use the channel up/down button and allow that new stream to come up, then return to the originally selected channel with the appropriate up/down button, you will get where you wanted to be.