Custom post type and featured images

Hi,

I’m testing out 3.6 with my custom post type.

When I try and add a featured image in a CPT, it opens the “add media files from your computer” as a whole page in the browser, not as a windowed page as a normal post does.

Also, once I do manage to save the post with a featured image, clicking the remove featured image link does not work, it just seems to be an anchor to the edit page.

I suspect maybe I’m missing something with how the CPT is declared? any ideas?

Thanks,

Jason