I received a package from Azure Dynamics yesterday with a field upgrade to the bolts on the AC24 motor for the EV kit. Apparently, the nylon washers weren't good enough to hold the bolts in under all conditions and some of them may get loose. I'm happy that Azure sent these before I started driving the vehicle around, although no major field failures have been reported.
Update: DOH! With the electric motor mounted in the car, I can't perform the upgrade because the bolts won't slide out. Taking out the motor would involved taking off the CV joints and lowering the whole motor/tranny assembly. I think I'm just going to risk this one or apply loads of locktite to the head end of the bolt... Rats.