I have updated to the latest version of media player. My shares were working fine before the update however they have now stopped working. I get the message permission denied(13). I know the shares are setup correctly because XBMC works fine and again they worked before the upgrade.
I had a similar problem, and deleting the Shares from Media Player and re-adding them solved it for me. If you have not already tried that it might be worth seeing if it works for you?
Thanks - just did that and it worked for me too… still a bug though - should not have to do that after an upgrade