I was never able to get a fix. I wrote and called MLB.TV and LG and each pointed the finger at the other. I was told by MLB that the app was updated and this would fix the issue but my app on the TV hasn't been updated since maybe 2015 or so. I keep checking for an app update and there is none.
i feel like this has to be an LG TV issue since I can use the app on other smart TVs, computer, tablet, AppleTV all without issues.