[Zope] Webdrive/FTP woes

Hi, Dunno whether this is a Webdrive or a Zope FTP Server problem so I though I'd ask here first. I really like Webdrive, but when using it to edit Python Scripts using Zope's FTP server, it has a habit of cutting the script in half and loosing the second half :-( Have any other Webdrive/Zope users experienced this? Did anyone find a solution? cheers, Chris