Ok, this is weird.
I'm using 1.2.2 version of Types.
I created a new custom post type. But even if I check the Thumbnail option, I can't see the Featured Image when I try to create a new post.
The weird thing is some days or weeks ago I create a custom post type and it have the Featured Image option visible.
I already check if Thumbnail is selected in Types. And already check in Screen Options: there is no Thumbnail option there...