Hello Trey,
I’ve tested the videos on Safari for Mac OS X from two different locations and two different computers with two different versions of Safari and Mac. Unfortunately, I don’t have your exact versions, so I’m not sure what the problem may be in your case. I have tried with:
Mac 10.6.8 and Safari 5.1.10
and
Mac 10.8.5 and Safari 6.1.1
Perhaps, try upgrading your Safari version, or you Mac? I’m at a loss as to what the culprit is in your particular case. I wish I could offer more of a solution than try using Firefox, or upgrading. Are you behind a firewall of some sort, or do you have some custom DNS you are using?
Abraham