I understand that this is volunteer support, but can't anyone give me
one reply in two weeks' time?

NetWare 6.5 sp5 with post-sp5 patches through July 5th.

We login to netstorage and can download successfully, but when we select
a directory and click on upload we get a blank popup window with "done"
in the status bar.

This is the same in both Firefox and IE.