**Fixed
Fixed, or at least to a point where I'm not having the problem anymore. After rolling back to previous version of both apps and screwing around with all the different settings with no positive effect I noticed the ezviz app had the db cam set to standard def. After changing it to "hi-def or "ultra def" the problem has gone away. Not sure why it would cause bi to show the upper left quad like that after exiting the ezviz app, but I've figured out the fix...