I can confirm it occurs on http://www.asx.com.au with AOS 9.0.2014.77 (Avast! Internet beta 2014.9.0.2014), Firefox 27.0.1. Other Firefox add-ons include AdBlock Plus 2.5.1 (filters: “EasyList” and “Malware Domains”), Hostname in Titlebar 2.0.2, Tweak Network 1.8, Web Of Trust 20131118. This is on Windows 7 Home Premium SP1 (64-bit).

The AOS slide-out panel displays normally on other websites I frequent.

Addendum: disabling AdBlock Plus for site http://www.asx.com.au and reloading the page still shows the cutoff of the AOS slide-out panel.