[TYPO3] Moc Filemanager - Download doesnt work

[andreas stein]

Hi List!

In a Typo3 4.0 I installed MOC Filemanager. Everything works just fine 
besides a important function: You can't download any file. The filelink 
seems to be correct 
(http://www.mypage.no/cms/index.php?id=82&filename=a.doc&dir=Presentation&task=download&mountpoint=1) 
but no download is started.
To make a directory or uplad or rename a file works just fine.

Any hint where I can work out this bug?

andreas