Both of your test cases look good and I'm seeing a response.
When you're not seeing a response, are you running the test in ITR? In other words, are you seeing a screen like this?
If this is what you're talking about, then you're encountering a UI bug - I've seen this behavior before. You see a response the first time you run the test, but not after you reset the session and run it again. I suggest ending the ITR session with the trash can icon and then opening a new one.
On the other hand, have I simply misunderstood your question?
--Mike