Well....
I d/l the file, and compiled it and got the same problem as you: only one front wheel working properly, for no apparent reason.
I assume its just a rare o2 issue or something, i deleted all four wheels and the selections and did the wheel structure and selection naming over again and then it worked fine. Have NO CLUE whatsoever, must have been a o2 glitch, or something. Anyway, it works most of the time..damn learning o2 is learning life;take one step at the time, its full of suprices and you NEVER, NEVER finnish learning it.... ;D
Just delete wheels and their selection and try again. Will most likely work this time....
BRSSEB