File transfer crashes Secure Global Desktop

My computer runs Win XP Pro, and I connect to a remote server running Windows Server 2000. After connecting to the server, if I try to transfer a zipped file larger than a few KBytes from my computer to the server, the Windows "copying files" screen hangs, and the session crashes, forcing me to log off and log on again. No problem transferring files TO my computer from the server, and no problem transferring large un-zipped files FROM my computer to the server. Is there a fix for this problem?

[505 byte] By [inward] at [2007-11-26 10:16:32]