After updating to WP 3.4 we can no longer properly add any .bmp media like we could before. The file uploads fine (shows up in upload folder) however, there is no thumbnail of the image in the Library and when the image is used it shows up as a broken link.
The same holds true for unscaled JPG images, which use to work fine. Any image that's already in the media folder works fine, it's only new ones added.
I've tried adding images under Twenty Eleven theme with all plugins disabled and the same problem exists.