There is a glitch in this wonderful plugin :
To hide a custom metabox in the edit form of a custom type, we can define in Adminimize a text list of html #ids (or .classes) with a matching text list of names. Those textarea are located below each checkbox grids.
The content of those textareas for custom type are not kept when the whole page is saved and reload. New ids are added in the grid, that's perfect, but the textarea are emptied. So when we save once again, those custom ids are discard from the checkbox grid.
The bug hit only custom types. It works well for pages and posts.
The (painful) workaround is to rewrite the #ids .classes and Names each time we change something in this option page.
Thanks for this great plugin !