http://www.youtubedoubler.com/?video1=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D364dzVsBs2o&start1=46&video2=http%3A%2F%2Fwww.youtube.com%2Fwatch%3Fv%3D5i7qZxICwgQ&start2=&authorName=Rex
Inverted's actually works
It also plays audio and video of both videos.
So it isnt just me having problems with TubeDubber?