I have had those error messages and the DR has worked. As long as it says waiting for jobs, I think it will work. If the machines you are sending the render to are slow and the file is large, then they will take a while before they start rendering buckets.
My understanding is that the DR spawner is still rather buggy. I gave up on it because it would take forever to start, buckets would be rendering the wrong view, or darker, just weird stuff. It worked sometimes and then others it just did weird stuff. I got a workstation with an i7 multithreaded processor and my render times were cut in half. Thats my best advice for now.
