Hm – I’ve got the same problem. I1ve read a lot about errors in functions.php, but disabled all downloaded themes and the error persists.
I even tried a full replacing the enitre wordpress directory with a fresh copy with no luck.
Also there is a javascript error:
Timestamp: 21.08.12 16:19:01
Error: Image corrupt or truncated: https://rodland.no/wp-admin/admin-ajax.php?action=imgedit-preview&_ajax_nonce=61e7e27bb8&postid=256&rand=80931
Source File: https://rodland.no/wp-admin/admin-ajax.php?action=imgedit-preview&_ajax_nonce=61e7e27bb8&postid=256&rand=80931
Line: 0