I recently updated to WP 3.5. I have updated all of my plug-ins, and they all say they're compatible with this version. I also tried deactivating all plug-ins, and I still have the same problem, so I don't think it's a plug-in issue.
I usually insert photos into my posts using the HTML provided by flickr. Now if I try to do this, when I go to save or preview the post, it sends me to a 404 page. If I use the WP media uploader and the link directly to the photo, the same thing happens. This doesn't happen if I insert photos from a different site, only with photos from flickr.
Does anyone know how to fix this? I really don't want to have to upload all of my photos directly to my blog. Site is emilyinchile.com, if that's needed for any reason. Thanks.