Just after I updated to WP 3.5 I noticed that my videos fail to appear when they post. Vimeo, YouTube, MacroMedia shockwave, LiveLeak, etc. All of them. WordPress has turned into an equal opportunity deleter.
Here's where it gets weird: I do a lot of "pre-posting" entries to my blog. I set everything up, set the time for it to appear, publish it, do a preview to make sure everything looks OK and go on about my day's business.
Then, when the time comes, the post goes up but all the video's code disappears. I go back in to edit it using Text (not the visual editor) to see what's wrong and there is no code there. At all. Blank! I then re-enter the code, hit publish again, and it shows up.
Is this problem related to the fact I pre-post? I can't spend all day sitting around adding stuff at specific times so telling me I can't pre-post makes me think it is a worthless feature. At least in 3.5