Please, stop printing and check all multipage files against previews. Only multipage designs are affected.
Orders coming trough Re-Order or Complete Order will most likely have one or more pages generated incorrectly.
We suspect there is a problem with one of team members committing wrong code into production. We are trying to roll back to the last stable build, but it may take a couple of hours.
Update: we are back to normal. The problem was eliminated by rolling back to a stable build.