I was having the same issue, but worked out a way to get around it. I posted on another thread last night, but thought I might as well post here too.
Although it looks like there are a lot of steps below, it’s actually really simple and only takes a minute or so.
Apparently Macs that use Lion and above aren’t compatible with the WDTV. But because Macs are based on Unix, you can use the NFS functionality on the mac to talk to the Linux functionality on the WDTV. I don’t know much about this stuff, but I kept checking help sites and trying different things. Here’s what I did:
1. First make sure the folder can be shared
• On your mac, choose the folder you want to access from your WDTV
• Select that folder and and in the menu bar go to File>Get Info
• In Get Info make sure the box that says ‘Shared Folder’ is ticked
2. Use TextEdit to write a single line of code
• Open TextEdit
• Write the file path to your folder, then a space, then the following text: -alldirs -ro
• For example, I’m sharing a folder called ‘Movies’ on my desktop, so the line of code looks like this:
/Users/Simon/Desktop/Movies -alldirs -ro
• Save the file (in plain text format) on your desktop as ‘exports’
3. Remove the .txt file extension from the ‘exports’ file you just created
• In the Finder menu bar, go to Finder>Preferences and click the ‘Advanced’ tab
• Tick the box that says ‘Show all filename extensions’ (you can change it back later)
• The text file you just created will now be called ‘exports.txt’
• Select the file name and delete the extension, so it just says ‘exports’
4. Copy the ‘exports’ file to a mysterious folder called ‘/etc’
• In the Finder menu bar, go to Go>Go to Folder
• In the pop up type ‘/etc’ and hit Go
• Drag your ‘exports’ text file from the desktop into the ‘etc’ folder. You’ll probably be asked to enter your password.
5. Change one setting on your WDTV Live to enable Linux Share Support
• In your WDTV Live menu screen, go to Settings>Network Settings
• Scroll down until you get to ‘Linux Share (NFS) Support’ and make sure it says ‘On’
To see your folder go to Select Content Source>Network Share>Linux Shares. It should then show you the IP address of your mac. Just select it and press the green tick and your folder should be right there.
I guess it’s not ideal, and WD should in their next update fix this issue, but in the meantime this method works well.