Customizing Problem

Hi, I am unable to use the “Customize” feature, to change the colors of content, etc.

When I attempt to change the colors using either the side panel option or running “Live Color Customizer”, it shows me the current page, for a second shows the customize buttons but then they quickly all vanish and replaced by a single “You are customizing” text. I tried disabling all add-ons/extensions in my browser that might interfere, but made no difference. I think this issue appeared when I updated to 2.0.

“Color Customizer” is the one selected as well.