Conflict between Obox Layers and Pro Sites

Hey there,
There is a conflict between Obox Layers and Pro Sites. The page with the slug /pro-site/ is empty. Changing to another theme (e.g. Twenty Twelve) fixes the issue. Problem: I tried using Upfront but it was too beta for my needs. Obox Layers works well for what I need, but obviously fixing the Pro Sites checkout page would make it much better! Suggestions?