I installed the older drivers. I didn't bother to do anything fun or fancy, like remove the previously installed drivers. I guess this was my way of 'kicking' the machine and hoping it worked.
I've been crafting on Vanguard for the past two days. I've had standard Vanguard issues*. SL has been just fine. How is this possible? Well I'll explain it in the only way I possibly can. I named the Machine after a primitive Raekartan Mage. Obviously doing something odd made it work.
*The running gag is that Vanguard will be better when it's "Out of Beta".