MLB.com made a change to their server responses that affect all users (NexDef and non-NexDef alike.) All users must take this new release (or update to the latest SVN revision) or nothing will work.
Here are the Release Notes:
This includes a mandatory patch to MediaService.xsd. This file must be copied to ~/.mlb directory even if you have already done this with a prior release. You will also need to remove your suds cache (rm -rf /tmp/suds).
$ cp MediaService.xsd ~/.mlb
$ rm -rf /tmp/suds
ALSO INCLUDED IN THIS RELEASE
Stream Selection Screen
You can now see which streams are available for the game you are currently watching. You can also adjust your stream speed dynamically during playback. Be sure to add or change max_bps setting in config file to 3000000 (3 million) to see all available streams or adjust the setting for your specific needs/preferences (slower machines or slower connections should use a lower setting for max_bps.)
Jump To Half Innings
You can use the 'i' (i for Innings) key instead of the "Enter" key to bring up the Jump To Innings interface. This is a line score graphic (without scores, no spoilers!) that shows which half innings are available to jump to. The availability of the bottom of the 9th is never shown so as to avoid home victory spoilers.