I'm experiencing the problem outlined in this kb article. http://support.microsoft.com/kb/927917 . Sorry I can't hyperlink cos i don't have enough points!

"This problem occurs because a child container HTML element contains script that tries to modify the parent container element of the child container. The script tries to modify the parent container element by using either the innerHTML method or the appendChild method."

The problem I'm having diagnosing the source of my problem is 2 fold: 1) This is only happening on some client machines (All are running IE8) and not others. How/Why only some? 2) I don't have any scripts which modify the innerHTML or call appendChild on any dom elements.

I do have server side code which modify properties on asp .net server controls. (Essentially all thats happening is a panel control with some more controls is being made visbile or invisible on a button click), would these in turn then set the innerHTML property of the client rendered control(?)