vray hair shader?

Unfortunately not. Per-object AA sampling is something that will be implemented a bit later on.

Best regards,
Vlado

We did test that and found that the multi-matte looked different. It seemed to be creating shadows from the hair onto the matte or something. I have not had time to really track down what the exact error was.

EDIT: I have attched a pic that shows what is going on. On the left is the multimatte generated from Shave hair, on the right the same with the vrayMtlHair3

Is it possible to update this without doing a complete reinstall?

It mightbe possible but it depends on your particular set up and the OS you are using.

Best regards,
Vlado

okay, what info do you need?