The title says it all, I had disabled blocking in my player.json due to it's anomalous behavior long ago. Due to the announcement of AI improvements tried it again, still doesn't work. Cheers. Solved with a new payer.json. My player.json became corrupted after a crash when loading game due to opening a file in another desktop. Sorry for the trouble caused.
"Game Options":{ some lines later "AI Logic Override":0, "AI Logic Override#":"use bitfields to disable certain AI behaviors. 1= blocking line, 2 = flexible superspeedway driving line", Cheers
I ran the race with default value of 0, AI defends by using the blocking line, which is right, but lapped cars shouldn't. Lapped cars shouldn't try blocking cars but remain on their normal trajectory. Cheers.
After forcing RF2 to create a new player.json everything works fine, GTE no longer use the blocking line when lapped. Didn't see it immediately because with the default option of full flags I spent three or four laps with a full yellow course so was not able to catche the GTE cars.