I've upgraded from AT Core/Pixture Reloaded 7.x-2.x to 7.x-3.x (AT = 7.x-3.1, PR = 7.x-3.0-rc1). I have a layout using the three-column regions, which were called GP 3 x 33% - First, Second and Third in v. 7.x-2.x. With v. 7.x-3.x the three panels and all other regions are stacked, not side-by-side as before. I've checked and I'm using the right AT Three column 3x33 - left, center, right regions, but it makes no difference, they are alway stacked. I've also checked the "Panels & Gpanels" settings and they also look fine for a standard layout, but everything always looks like seen on a smartphone. I've the same effect on IE9, IE10 and FF15. You can see it at http://ss-dev.web.cern.ch (a test site for my main site sciencesoft.web.cern.ch, where I'm still on v. 7.x-2.x). Is there any settings change I should do? I've just upgraded the themes, nothing else.