DIV Properties Error

I have a standard page in safe edit status and when i Edit the contents and click the image to change the DIV's properties i get an error. See the attached image.


If i click no the properties display fine. If this page is Live then i get no error when view the DIV's properties.
DIV_Properties_Error.gif (18.3 KB)

Anybody else seen this?

My advice is to completed clear your browser (and any intermediate proxy) cache. We are continually updating the JavaScript files, and if you have an older cached version, it may cause these types of errors.