The question has been closed for the following reason "This question won't help future visitors" by Graeme Perrow 09 Jun '11, 06:41
Newly uploaded files will work. Note that the images in this question and Volker's answer were never uploaded in the first place, so that's why they don't show up.
answered 04 May '11, 11:18
I remember having such issues in the forum beta when I closed the upload dialog too soon.
FWIW, I have uploaded images/files several times in the past weeks, and now this one:
aarh - fails, too.
Quod non erat demonstrandum.
Time to link to this page:)
New attempt with freshly loaded browser: