It is hard for me to suggest something more because I don't have access to your browser, but it seems you are using a plugin that might be messing up AJAX requests.
Do other tools in the EoC hang like this? Task Editor? NPC Editor? Item Editor?
EDIT: Also can you manually visit this page?
http://eoc.akkadius.com/AllaClone/eo...=11&Selector=1
This is a typical request.
EDIT2: Do you have heightened security settings set to not trust certain types of scripts? This can happen with FF.