Yes - I think this issue hails back to the previous developer; which was never resolved; but with some newly discovered wrinkles now added.
Let me address these by first saying your plugin has great potential, and is the best i've found. However, until the issues discussed below are finally addressed, I will be unable to continue using it. It's my hope that one day these issues will be taken care of, so I can use it once again.
I kept it all this time because I frankly lost track of this project for awhile, as it's a personal website of mine, and I had been dealing with client concerns in other (paid) projects. But now that I am able to give it a little time again - and since these issues were never addressed by the last developer - I must (for the time being) revert back to using YouTube's embed code instead.
These are the issues..
1. Most Recently - none of my YouTube playlists will work with your plugin; giving a message that the video is not available at this time. Although I can build a playlist directly from within WP with your plugin, I am not able to use playlists hosted from YouTube.
2. Ongoing - Full Screen mode does not work.
3. Ongoing - Go to YouTube (in the upper right hand corner) does not work either.
Since most of my videos are best viewed in HD resolution in full screen mode, unless these features are available and work, there's no advantage for me in using your plugin.
I appreciate that you are the new responsible party now, and will need some time to address these three issues; and it's my hope that if they are ever dealt with 'you will let me know.