Background colour of main area since updating to Panino 0.2

Hi Guys,

Since the recent update to Panino 0.2, all my main background colours have turned to a bit of an ugly blue colour, though 'new' page creations have the rather nice default textured white background. See this work in progress for example (for the desired background):
You can see the blue background by viewing most other pages on the site.

I tried selecting the "make global" checkbox on the edit background feature of the new page, but that did not seem to work.

Is there a simple way to globally update all the existing pages to adopt the proper default "main area" background?

Many thanks in advance.