Adobe Reader X "Back" Function

Hey, tried to make title as relevant as possible lol

At work we use a large set of publications all set in pdf's. Having a "top" type document that just links to the other pdf's relevant to that system. i.e.


Prelim (top pdf) -> Communications or Navigation etc. -> VHF or UHF / GPS or TACAN etc.


The problem i have, is since our work computers updated to Adobe Reader X some time ago, once you've used a link to go to a new PDF/Sub System, you can no longer just Alt+Arrow Key back to the previous document as you could with the previous version.

This is annoying in the sense that you have to re-navigate from the "top" pdf to get to a different system.

I was just wondering if anyone knew of an option or something that was defaulted to stop this from being an option maybe...

Cheers,