swfu doesn't work

The Flash Upload in the "photos management"-tab doesn't work.
It shows the sign "queue is empty" and above the Link "Click here to select image", but nothing happens by clicking the link. Just nothing (no error message, no window). If I open the page with the ie. the link is gone, only the "queue is empty" sign is still there.

Perhaps the swfu code is in the wrong dir. ?

Please help me.

P.S: Single upload without swfu still works.