Need to permic MAC users ftp access w/o directory change

["Chuck Wannall" <cwannall@xxxxxxxxxxx>]

I need to allow users on MacIntosh computers (some versions of OS X)
ftp access to our system.  The problem is that I currently am using an
exit point program to block directory changes and the mac users are
therefore being blocked from logging on.
 
The mac users are connecting via safari or internet explorer or via the
native mac external connections (?).
  
The users can connect if I disable the exit point program or disable the
directory changing.
 
Has anyone else ever had this problem or know what I might be able to
use as an alternative?
 
Thanks,
 
Chuck Wannall
California Institute of the Arts