Mine is also having problems as when I start changing the Type it adds numbers after the tags:
From Header .... to.... Header2323232323
It also keeps opening up the templates instead of adding the changes I put on it. i don't know what it is but CSS Sculptor has been very buggy on me recently making it impossible to get these layouts created that I need. Sometimes it doesn't let me change the heights of the topnavigation area, other times I can't change colors on the background for topnavigation. If you would like pictures or anything, let me know.