Many times, topics, like this one, just seem to end abruptly. This one ended 11 months ago.
I think I may have had the same problem with using a Network Resource to change my A/V input. I can't remember exactly the circumstances; however, what I did for each of my A/V inputs is set them to a Program instead of a Network Resource. Then, in the Program itself, add exactly 1 line to the Then Action, which is "Resource '<resource name>'".
Example (note: my Resource and my Program just happened to be named the same):
