We are not sure whats happened. We had 3.7 and CustomPress installed. The columns all showed up OK. Our client this afternoon reported that they could no longer see any of the custom meta in custom post type columns but the custom meta is available when they edit the actual post.
I therefore tried upgrading to 3.7.1 and the latest version of CustomPress but to no avail. The data is in the DB, but its not being pulled into the columns.
Another behaviour they reported was that Posts2Posts was no longer able to see relations from one post type to another. Examples Agendas and Days are related. If you look at agenda you can see the day its related to. If you go to the day, it does not list any of the agenda posts... so again the data is there but something is not happening.
I know you didnt make posts2posts but wanted to describe that also to see if it helps in working out if CustomPress has some odd issue?
Any pointers greatly appreciated.