Funny!! in my IE select boxes have values, but the wrong ones and selected are ones in the correct place. Looks like semi-cached.
Did some google on that and lots of people have the same problem with IE's back button...
The only proposed solution is to make IE not to cache the page.
Storing selection in session variables it would a good solution in the case you use select boxes
for navigation. But still dont know if IE will re-execute server side script when you press back button.
A test will show
