Shared folder not shown on windows 2003 server

Hi,
I have folder sharing problem on one particular Windows 2003 file server.
The mapped shared folders 'some times' show nothing in them. If I tried to
use UNC from start/run, the shared folders would not show either. I have to
use FQDN like \\server.domain.local\ in order to see the shares and the
contents.

The only difference on this file server is it hosts users' redirected "My
Document" folders via group policy. I think it's has caused the problem
because I had an old server before which used to host redirected folders has
the same problems.


Please advise.

Thanks
Calvin