I did as you suggested, I unsubscribed to all non-ISI/Studio 397 and kept a few official cars and tracks. I went into a track, exited and when I tried to load Silverstone again rF2 crashed.
Other than the SimCommander for my AccuForce and the SimDash for my wheel's display, I have no other plugins. I can try without the SimDash if you suspect it, I can't drive w/o SimCommander though.
If the plugins are not at fault; could this be caused by something else in my system? Bad RAM? Although I have stress tested my PC and everything checks out fine.
PS; I just ran a full memory test, no errors.