I'll chime in because I have the same problem.
Just purchased the YouTube Module and downloaded the instructions. Usually I can set something up without ever referring to the documentation; in this case not only did I have to refer to the documentation, but even after doing so I'm still stuck.
I like the beginning of the Installation Guide ("To install the YouTube Module, follow these steps:... Step 1), Step 2), etc.").
But then, all the documention does is say WHAT you can do... not HOW to do it.
Suggestions for improvement:
4). From the Extensions Menu, select Modules
5). Scroll down until you find the mod_youtube_channels module.
6). To configure.... etc.
Then put step-by-step instructions there.
I've configured it correctly *I think* but my video is not displaying. Why? Who knows, but the troubleshooter in the back of the documentation is not that helpful. It gives suggestions, but again -- doesn't say HOW to do so:
Example: "Verify that there is nothing else loading jQuery." (How?)
"Make sure that you have cleared the Joomla! Cache" (How?)
Also, on the module itself, the following instructions appear:
"Choose to the Player type
And then Video ID, Playlist ID, Custom Player ID, or the Feed Options below."
Should all these fields be filled in? Only one? Which one? I think I figured it out but it's not apparent... it should be step-by-step (i.e. "If you are using a single video, then select 'Single Video Player' and fill in ONLY the Video ID field...") or something similar.
I hope this helps! Meanwhile, I'm off to find out why a big blank white space appears where my video should be...