Is it a crash or a freeze? If it's a freeze, what exactly happens e.g. does the Awasu window go all-white, if you click on a menu does the menu drop down, can you switch between browser tabs?
What happens if you open a URL directly (File|Open web page? What happens if you click on a link in the browser pane?
Does it make a difference which channel you use?
If you don't mind losing your archived content, try deleting your archive.db file.