I recently got the 2020 maps update (which I returned for a credit since local streets added in late 2018 still aren't showing) and ever since then the USB memory stick that had three playlists and a bunch of songs on it doesn't work properly. None of the playlists show up and only a few of the songs on the stick are shown. I switch the USB stick to my Lexus and it plays just fine there. I've sent an e-mail to GM to see what they say about it. But wanted to warn others that the update might be breaking other things.