Hi Nadya
Visit once
www.novell.com, check their support pages for VFP/Fox issues.
You'll find a lot of them, most concerning client versions, client configurations etc.
Maybe you find something that help in your case. We used for several years a Netware network with our FPW app with not a single problem, but after having seen that site I mentioned above I think we just have had luck. :)
Happy new year
Markus