After the update, I found an issue that could potentially soft-lock you into "car settings" menu.
I was doing the bump-drafting race at the Watkins Glen Short course, and was checking out the race restrictions when selecting a car from my garage; the PP cap was 720. When I went back to look at the pre-tuned cars that were offered, I noticed that both the Mustang AR and Viper were both above that 720PP restriction. I thought nothing of it, chose the Mustang, and did a round of practice.
When I got to qualifying, I opened up the car settings menu to see if I could make changes to the tune between rounds (I couldn't), and when I tried to exit the menu, the game kept giving me an error, saying that my car was above the 720PP limit. I ended up having to change my tires to Wets to get out of the menu, but then I was only allowed to use Wets for the rest of the event.
The Mustang AR started at about 736PP; the Viper was somewhere around 743PP, I think. It makes me wonder if there are other pre-tuned cars in the Power Pack that go beyond the race restrictions where changing the tire compound won't get you out of the car settings menu.