I've had one crash since the patch after a custom race weekend on Derby.
Having fun with career mode, AI does need to be a bit less rigid, if you bump them you tend to get bounced off and end up spinning whilst they just stick to their line, but they are infinitely more racey than they were pre-patch.
One minor niggle also is the Nurburgring 24hr track, comes up early in career mode if you choose the 964 Trophy, 4 laps. However, for qualifying, which is a 10 minute session, you have to do 2 whole laps just to get a Q time, and that isn't enough in things like the 964. What happened to games having the cones at the final turn for the GP circuit so you just do an outlap on the GP circuit and do a timed flying lap without having to do a whole Nordschleife outlap?