I'm having a problem adding slides. I do an Add New Slide, choose a featured image, hit Publish, then go back to my list of slides and it's not there! Really! I'm not just pressing the back button! I mean, I go and look at the list of slides and no matter what, when I publish, it just goes away or doesn't save. No error. Other content (pages, posts) are working fine. Is this a compatibility issue with 3.1?