I updated to WordPress 3.5 and now anytime I add an image into a new post it will ONLY show up as a thumbnail in the post. No matter how I set up the image in the post (use full size, half size, manually change the size) it will only show up as a tiny thumbnail in the post. What is weird is that it "changes the size" in preview or after I publish. In edit mode it's fine. Past published posts are doing the same thing with images.
Here is a link to a post where this problem is happening
Any way to fix it without using code?