This is my first post here after emailing Support. My Blog is http://shimworld.wordpress.com/ and this morning I paid for CSS Editing feature. I have used MistyLook 3.1 Theme for a week now and after I pasted the new ver 3.2 codes, the custom header disappeared. Instinctively, I reloaded the original header and that too disappeared and no matter what I did, it no longer shows when viewing site. The original and custom header both show when you're in the Custom Header edit page.
I searched the forum and read similar problems and people kept saying WordPress is aware of this problem and are in the processing of fixing it. The thing is, these posts are dated January and there has been no follow-ups to this problem (at least I've not found any responses that say otherwise).
Another thing I noticed earlier. I switched to Contempt Theme and found the default header to be distored and messed up! This tells me there's some kind of image corruption going on in that headers from other themes aren't showing up properly but they are showing nonetheless.
I can be contacted [email redacted] if someone wishes to reach me by email.