Nope, like I said before, for most of our editors it works fine.
There are just 3 editors that i know of where the editor crashes and they are going through a restricted network (altho not the same network), which i am guessing is the cause of the problem.
Does your code use any ajax type technology?
I know this causes issues on their networks.
Other than that I have no idea either...
Sorry another quick Q, when you asked them to try the demo again, what did you do to it?