> Clear the cache via ftp stop the error and I had a blank screen. To make the story short, I installed 1.8.2 to realize that I cannot edit html in the wiki pages and that chat & games wrer giving errors.
On Admin->Wiki there is a new option for HTML editing as its basically a securing risk allowing that for everyone. relates to CSRF and XSS issues.
Enable that new checkbox and you should be sorted.
Chat and Games, I dont know about, dont think they were touched inbetween versions. What error messages are those feature reporting?