It seems as though there have been several issues for MLB.TV in their video delivery since they’ve converted from silverlight to flash. 

http://www.pcworld.com/businesscenter/article/162805/mlb_in_social_media_stumble_with_mlbtv_blog.html?tk=loom_art

http://www.mlbsupport.com/forum/viewforum.php?f=32&sid=9918c1deb0497b6bb42cdba88be50c1c

 

maybe they should have stayed with silverlight.