Lost network access to external drives

Hi, I'm using Leopard on my MacBook Pro and my iMac. My iMac has several external FW and USB drives connected. They use Mac OS Extended Filesystem (Journaled).
I have AFP and SMB sharing turned on in my System Preferences. The only folder that's listed as shared is my home folder.
It used to be on my MBP, I can browse to my iMac in Finder, and it would show my home folder plus all my external hard drives. I would be able to click on the drives and start using them like any network mounts.
All of a sudden these drives are no longer showing up when I browse. I only see my home folder listed.
However I plugged in another drive via USB on my iMac... this is a FAT32 drive. It automatically showed up in the list of shares I can connect to on the iMac, just like how my external drives used to be.
I haven't made changes to System Preferences or to the Sharing pane.
In the Sharing pane, I tried specifying one of my FW drives as shared, but that didn't work. I've made sure the share has read & write permission for my account, and read permission for everyone. On a separate note, I'm not able to set the permission for everyone to "No access". That option is greyed out. I can only choose Read or Read & Write.
However, even with that, I can't see this new share in the list of shares I can connect to from my MBP.
Does anyone know where I went wrong? Thank you!

I had the same problem. I repaired permissions and now all is well.

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