I don't have a smart TV but the Lightbox App on my Android phone appears to be working (it's permanently signed in), but if I go to "my account" in the app menu, it opens a browser (Samsung) and I can't login. I also can't login on Chrome on Android. My email and password are correct.
I haven't opened a support request yet. That's my next step. Just wanting to see if anyone else is having problems or not. Nothing is mentioned in the "other" section of Spark outages, or on Lightbox' FB or twitter page.