I have 2 users using readynas remote. If the shares aren't there...
-Ensure that your Share account username/password matches the Windows/Mac logon username. If not create a local account on your PC that matches it. Retry. If not working, try logging on with that account and testing.
-Check setup http://www.readynas.com/?p=1435
-Test your account, ensure you can loginto your readynas profile:https://remote.readynas.com/
-Remove/reinstall ReadyNAS remote (this fixed one issue i had on OSX6.8 where the readynas software mysteriously "vanished" but the tray icon remained...work that one out!)
-Try "automatic proxy detection".
-After you log in, it connects the relay in about 1 minute, look out for "You are now using a Relayed connection" before trying.
Hope this helps