Adding Youtube information
Design and Skin Customization
The cause of the issue appears to be settings at Youtube for the API key that you are using.
I've added some checks to the next version of the module to make sure the key you're using will retrieve videos.
If it cant retrieve videos from youtube you will see an orange light in the
ACP -> MODULES -> CORE -> CORE -> TOOLS -> SYSTEM CHECK
area.
In the mean time, click on the SAVE button at
ACP -> MODULES -> PROFILE -> YOUTUBE -> GLOBAL CONFIG -> "Save"
and that will run a check of your API key against youtube.