I delete theme files from Appearance/Themes, then downloaded and reinstalled version 2.4.2 from scratch. No change.
When I deactivate ALL plugins, display of Pages is CORRECT. When I add back in the Jigoshop plugin, it BREAKS. However, I will point out again that this was not the case with Pagelines 2.4.1.
There obviously is a conflict with Jigoshop and Pagelines. When I activate the Jigoshop for Pagelines plugin, it does not correct the issue either.
So, short of hacking some code, which I don't want to do, there is no resolution. If you have some CSS code that I can add into Pagelines, I could do that, but the ultimate fix will be to issue an update to the "Jigoshop for Pagelines." plugin to enforce compatiblity.
Ok I've logged in and taken a good look. From what I can see I agree with Danny, but I can't see where it is coming from. On the non-jigo pages you're missing the css for the content/content-pad
Now this could either be down to a plugin (which even though inactive could be affecting the site) or due ot a corruption in one of the core files. My first bet would be to resinstall a fresh version of pagelines via a new zip downloaded from your launchpad account -
if that doesn't work then try deleting the third party plugins one by one to see if any of them has a direct effect on the page layout.
I've checked your debug informaton, there's nothing in there that would cause this type of layout issue.