I accept challenges - except when I first get into a license class and am reconfiguring my cars. Then I run a test race and open them up. I'm Class B now.

Even with the open strategy I'm still #3 on the Best Weekly list O.o (have no idea how that happened - I generally stink at video games).
At the moment, I'm suffering from a glitch like Revengeracer's - I'm stuck at 2 wins, even if I should have been credited with others. My spendable points are also stuck. I've reported both so hopefully they get fixed soon.
EDIT: My cars are in Island Run, Glacier Dash and Cactus Canyon if anyone wants to race (though I'll be having dinner soon).