Block controlled by context disappearing on commerce checkout page

Issue Summary

Hi,

I have a site with a "winter" and "summer" section. I have two contexts:

"winter": to be active on pages with /winter & /winter/* paths

"summer" to be active when winter is not active, or on the page or on /summer & /summer/*

The contexts activate a menu into the main menu block and also set the body class "summer" or "winter".

This works for every page except the commerce checkout page with the path "/checkout". It works for the page "/cart". So on my checkout page, I don't have a menu.

On the checkout page, no menu appears BUT the body class "summer" is set. If I add /checkout & /checkout/* to the summer context there is no improvement

I am using:
context: 7.x-3.0-beta4
commerce: 7.x-1.3
Fusion: Fusion Core 7.x-2.0-beta2
Mix & Match: Mix and Match 7.x-1.0

If I switch to Bartik and put the menu's into the sidebar, the summer menu appears (correctly) on the checkout page. If I use mix & match and have the block in the sidebar (exactly like with Bartik), the menu doesn't appear on the checkout page.

cheers
Rich