Cannot access anchor on 4.0 page

Accessing a page anchor does not scroll down to the anchor location but just displays the top of page.
example:
http://confluence.atlassian.com/display/JIRA+Issues+Macro#displayingalistofjiraissues
(I validated that "displayingalistofjiraissues" is a valid anchor within his page)
The page does not scroll down to the location of the anchor.