[Zope] zwiki and ftp on linux

Hi there, when I edit a zwiki entry (ZWiki V0.32) the transfer process starts, everything is read (the indicator shows 100%), but the transfer never finishes. I tryed this with a number of ftp clients and editors that can load a file trough ftp. (I tried on two machines). If I do the same on a windows box everything is fine. what could be the reason ? thanks Robert