Another NFS problem I'm afraid.
Machinery: Desktop with LXDE 2010.12 updated, installed to / after a crash and burn. / is on a 10Gb partition as /home/mdm. There is a second partition of around 20Gb with all the previous install data on it, which mounts as /media/disk/mdm.
Laptop with 2-week-old LXDE .iso installed (2010.Final?) and updated, also to / for the same reasons as the desktop. This machine too has a second partition that mounts as /media/disk/mdm with all the data on it.
What I did: (With a little, make that a lot of, help from Just19)
Desktop; created folder in /home/mdm called Shared_Stuff and gave ownership to mdm and everyone given rw.
Did PCC>Sharing Things>Share Drives, and created a share from the Browse box of /home/mdm/Shared_Stuff with the default noid and all the Advanced settings at no. Closed out and rebooted.
Laptop; From PCC> >Access Shares, the server wasn't visible to the laptop. So I did Just19's suggestion to a previous query of mine on the Forum and modified /etc/fstab by adding a line pointing to the server share. Rebooted, and the laptop could see the server but not the share. Interestingly, in around a week of experimentation I have had the share visible and had >>Access Shares modify my dummy fstab line into a proper entry in the file but never, NEVER, would it mount. Alas, now the share cannot be found at all.
Some numbers; The server id is 192.168.2.3 and the laptop is 192.168.2.2
Just as an aside, I flashed up my EeePC and modified the fstab file to point to the server share but the result was the same as the laptop; 192.168.2.3 is visible but no share. The EeePC has, for reasons we need not go into here, LXDE 2010.06 updated to around last December installed fully to a SD card and doing quite well thank you.
Firewalls are off. Printer attached to the desktop server connected wirelessly to 2 laptops and the Eeep works.
Conclusion; The server isn't mounting the share?? What to do.

Thank you for your consideration of this,
John.