Djay pro windows not loading tracks to decks, stops responding to controller

Loading tracks from where? If you’re pulling them up from Tidal, you might want to have a look at
https://community.algoriddim.com/t/so-tidal-hifi-is-now-broken-in-djay-pro-and-alogriddim-says-we-have-to-use-normal-and-high-now/20351/2