I have been using my Slingbox for years with no problem with the Slingplayer Desktop application for PCs. I got my first Mac for Christmas and when I connect using the desktop player, there is no sound and the video seems to be moving at 1.5x. I am in IT, so I know networking, but I can't seem to figure out why the desktop player does not work. If I log onto the website through safari, it works. I would really like to use the standalone app. Any ideas?
Have you tried the direct connection to check if the issue persists? Take a look at this link,
That link is for Windows but you can modify the settings doing this; Go to Window > Slingbox Directory > Add and select direct connection, you will need the WAN IP address and the port number.
Regards and let us know if that works