This error can be resolved by editing the chat.aspx file and changing the first line in the file. Look for MasterPageFile="Themes/default/Common/master.Master" and change it to MasterPageFile="Themes/hawaii/Common/master.Master"
CS defaults to the Hawaii theme.
Unfortunately this doe not resolve the issues. The global.ascx uses components that are depricated and I cannot get past that step.
This a pretty critical thing for me. Does the new code you mentioned in another thread address these issues?