I'm replying to this old thread because I found this out just now! (I was having the same trouble.)
You have to edit the ".paintchat" file in your paintchat web folder. The one in public_html. The one in the www folder outside of public_html updates fine, but not that other one, for some reason. So I downloaded it, saw outdated figures for size, edited it, and reuploaded it. That fixed things.
Yay, for posterity!