Files hidden from view on a mac

Hello,

When up loading files from any of our Macintosh to our windows 2003 server
using the (User Authentication Module (UAM))  people on the macintosh
platform can't see the files but the p.c. people can.  We are perplexed by
this issue and are wondering if anyone has any insight to this problem.
This
problem is repeatable.

Thanks, 
Shelby