I have just updated WP to 3.5 and I am finding loads of problems.
The Major one is that all of the images that were loaded by NextGEN that were not installed into a Gallery have all lost there links? The files are still on the sever, but none of them can be found.
Another issue is that if I try to upload some images to a NextGEN gallery, I cannot see the page appear, I select the link 'Add Gallery/Images' I just get a blank page!
Is there a way to roll back the WordPress version? This version is way too buggy! Even WordPress'a 'Add Media' option which is new to 3.5 does not work at all.