To unassigned a power in a deleted chat ;
If you had a group power assigned to a chat that is now deleted or redirected, follow the steps below to help you un-assign your power.
Attempt to use the /go command. Go to any chat and type /go CHATNAME and see if you are able to connect to the deleted chat. If not, go to the next step.
Copy the following link "http://www.xatech.com/web_gear/chat/chat.swf?id=IDHERE" and replace IDHERE with the deleted chat's ID. To get the ID of the deleted chat, login and scroll down to your group power assignments. Right-click on the group it is assigned to and select "Copy Link Address". Paste the link into your browser's URL bar and copy just the numbers and insert them into the link above. For example, if your chat link is http://xat.com/xat12345678, your chat ID number is 12345678.