Jerdo, that is not really an acceptable solution. You can't expect every user of your system to upgrade to a specific version of IE.
Thalos, unfortunately, it's nearly impossible for anyone here to diagnose what your problem could be. My guess is that it isn't the "back" button causing the problem, but something on the person page causing it when you exit. I would recommend you make the person page very simple (save your old person page), then try it out. If it's ok, then you'll know that something in the person page is causing the error. Then add one element at a time back to the page until it crashes. This is a time-tested method of debugging, and should help you pinpoint where the problem lies.
Once you do find the area or command that is causing the crash, and you still are stumped, then come let us know what it is and we'll see if we can help!
Good Luck!