I have that bug too. You aren't alone.
Still it happens only with Raceroom. Pcars works flawlessly.
Solved. It is Steam witch have to restart and login again. Every time, when Steam updates. So, it wasn´t your fail.
Dump file if you are intrested.
Weird Thing... That guide you wrote about, didn´t fix the problem. But when I messing with steam start options happend something unusual. Game...
It happend first time 2 weeks ago, but it fixed by verfying by steam site. Game worked perfectly till two days back. Now it crashes at start with...
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