Networking :: Samba Update - Cannot Mount Network Shares Using Script

I've, for years, been using a little script, as user, to mount network shares, like this:
mount.cifs //server/Data ~/Data -o username=robertw
Previously it used to be smbmount, but that changed. Anyway, the latest updates have stopped me be able to run this as a user. I tried running it as root and that just won't let me get access to the shares, tells me permission denied. I thought I'd try using fstab. This gives varying degrees of success.

Here are two of the entries:
//server/CAD /mnt/CAD cifs credentials=/etc/samba/auth.server.robertw 0 0
//server/Data /mnt/Data cifs credentials=/etc/samba/auth.server.robertw 0 0
The auth.server.robertw clearly shows my correct username and password.

Now, I can't get into the /mnt/Data directory at all, just says permission denied and I can only read from, but not write to, the /mnt/CAD directory. My /mnt directory is like this.
drwxr-xr-x 20 500 505 0 2010-05-11 06:21 CAD/
drwxr-x--x 170 500 501 0 2010-04-09 23:18 Data/
I'm on Mandriva 2010 if that's important.