When I upgraded to WP 3.3 I also, for the first time, installed 6Scan
I noticed on new posts/pages that I created I had all the standard publish boxes, publish, categories, tags... but on old posts I wanted to edit all those boxes (right side boxes in 2 column layout) were missing...
I went through and disabled my plugins one by one and found that after I disabled 6Scan all was well. I could then re-activate 6Scan and it was still ok... but after you log out and log back in the issue resurfaces