hang on! spoke too soon . . . i left it open in the background....
it took a while, but the trust certificate popped up and then a while later i got the reviewer screen. and that's where it stopped:
i got the following error message stating that the content could not be found. as i said, intel mac/osx/safari is what i'm using. seems as though if it can get the reviewer up and display the name of the file you uploaded it's likely to be permissions as you suspect . . .
~/archiben
b e n f r o s t
b f [a t ] p l a n b a r c h i t e c t u r e [d o t] n z
archicad | sketchup! | coffeecup