Trying to mount a samba share from a newly installed FC6 installation.
No problem connecting to this share from my other RHAS4 or FC5 installations. The share is not the issue.
I installed the smb-client and executed 'yum update' for the FC6 system.

# mount -t cifs //server/share /mnt/mountpoint -o user=nobody,password=nobody

# dmesg|tail gives:
CIFS VFS: Send error in SETFSUnixInfo = -5

After executing the mount command I can not delete or 'ls' the /mnt/mountpoint directory. Something is corrupt:

[root@server ~]# ls /mnt/mountpoint
ls: reading directory /mnt/mountpoint/: Invalid argument
[root@server ~]# rm -R /mnt/mountpoint/
rm: descend into directory `/mnt/mmountpoint/'? y
rm: reading directory `/mnt/mountpoint/': Invalid argument

I tried to google the dmesg error but found nothing that could help me.

I made a network connection to the directory using NFS.
This solves my problem, but does not solve the issue I described. If someone can help me out then that would be great.