There have been many strange reported sitings of Igor over the years. I last saw him in the Logic 205: Synthesis with Sculpture tutorial.
I'm beginning to think he may have a cult following... Although, that could be the reason why Steve H. won't let him into the studio for TNT2 series ;-)
However, he seems to have broken free and can be seen at the bottom of the following page:
It's safer to look at him for less than 30 seconds at a time ;)