the Series selection screennow appears empty to me, i cant select any series (not even all tracks & cars), verified my files integrity but the problem still going.
Happened to me once, looked in my ...Steam\steamapps\common\rFactor 2\Manifests folder and there was the all tracks & cars_10.mft along with a shipload of others.....deleted all except for the all tracks one and been good since, I'm assuming (yeah I know I shouldn't) that one of them was buggering it all up.