What kind of problems you have? For me it is working as usual.
Plenty. AI not pitting in various events, AI turning into the pitlane wall on starts, and many more.
The absolute worst one, though, is the fact that the app is not supposed to activate unless you're in single player race or weekend - but due to it being broken by a CSP change, indeed activates every time you enter any session. Worse, the radio button to disable/enable the surfaces.ini change is broken. Hitting the "disable/enable" toggle and restarting has no effect almost every time I use it.
This means that every time I enter an online event, my surface.ini gets changed. For my league events, for example, that means with his app installed, I can join the open practice on race day, leave to eat, rejoin for quali, and get checksum kicked. For public servers, it means that I can be permanently locked out - I had to recently get a Spa surfaces.ini from RMi here last week, and had to pull my backup of Vallelunga as well. Extremely annoying.
There's a new app version released today, I'll take a look, but the negatives far outweigh the positives at the moment. It works in single player, sometimes - and far less than on previous CSP versions - but at the cost of going to war with the app when it comes to online.
I uninstalled this app and will likely keep it so until I see a changelog that addresses the issue. I'm appreciative of his work and it is undoubtedly the baseline for many AI behaviors in AC for the future, but it's got quite a ways to go.