The bad news is... I suck.
I'm trying to duplicate a hype document with ONE line of JS. (simple! the good news)
I've enclosed the original that works (which I didn't create...) and the one that I've tried to make essentially the same... but it somehow fails.
The only minor difference is that I'm using a rectangle instead of an ellipse for the slider.
I can't find where the critical difference lies.
All it is, is the implementation of a video with a scrub slider. Spent hours on this... I need a new set of eyes.
[Edit: There is a hint. The console reports that the video has a value of 'null' on the non-working version]
Thank you for your kind help.