At scale the Plugin Manager popup for agents that do not synchronize freezes the page and makes it unusable.
Changed the css - added max-height and changed scrolling.
I can't to check this fix because i need server with many many plugins.
verified in Version 4.6.5.BUILD-SNAPSHOT-2012-02-21
add new plugin to pref environment and opened the Agent status list.
and tested that the scroll bar in the left side and could to scroll up/down. and I see the all the list.