Looks like LG might be killing two birds with one stone on the 334 and the MLB.TV issue. In the past 24 hours, here are some of the more meaningful moderator posts on MLB.TV forums (which you can't access unless you're a subscriber):
"we are experiencing technical difficulties, LG is supposed to release a Firmware update sometime next week or maybe later in the month, which is going to solve this issue. Thanks for your patience."
"We are working on resolving this, an update will be available in Early-Mid April. I apologize for the inconvenience."
"LG will be sending out an update soon to correct the current issues. we do apologize. you can still stream games on your computer until the update is pushed out."
Nothing clear, for sure, but perhaps the next update will not only benefit the MLB.TV subscribers but also help the 334 problems, too!