Can't view custom post typed

I have migrated a custom post type, but when I add new items I can't view them in the /wp-admin/edit.php screen.
I have been working on a custom post type copied from another project. It seems to have been brought over mostly ok - but the problem is when I view the /wp-admin/edit.php?post_type=xyz page I cannot see any of the items listed. I CAN, however, see the counters at the top telling me there are 24 items of that type in the system... Can you help me figure out what might be happening?