Advanced Theme Switcher does not remember old widget settings


I have manually activated 20+ themes on a single demo blog.

Each time I would check the front-end layout and configure and save widget placements as necessary.

Now, when I flick through the drop-down adv theme switcher widget, it is not remembering widget placements.

This only seems to happening on some themes, and took 1 hour to config all themes.

Thanks for investigating,