Yes, I wound up figuring out that I had not uploaded your version of product_music_extras_dhtml. The problem was that I thought I had.

I did understand the "admin\includes\boxes\*" as 'everything in the boxes dir'. What happened was that I was going to select all inc. extra_boxes/ but then thought 'well, maybe I should look in here first so I have an idea what if anything I might be clobbering. Unfortunately, I then forgot that I'd done that.

I've actually through a bit of a tale of woe... somewhat comic... but more on that later.
A the moment though, the one overwhelming question in my mind is... what does OTT mean!?
(Especially as I think I should be able to guess.)

Gotta say tho, this is looking really cool...
thx...