After upgrading to WordPress 3.3 I noticed that Media Lib Cats v1.1.1 would no longer allow me to 'Set a Featured Image' for images that I selected through the image category. You can still set them just fine via the normal library but with thousands of images this is unworkable for me.
It only hits problems when you select the image through the media cats library plugin. Upon clicking to 'Set a featured image' it just does nothing whatsoever. I note that the URL for setting a featured image via the library (works) is different..
..from the one you get when hovering over the same button in Media Lib Cats..
Urgent fix required please.