I was running this setup with PT9 and snow leopard without any problems.
Lynx has been a little vague on the whether its a PT11 prob or a mountain lion problem. Either way, i do not get the feeling this is an isolated incident and i have been advised to wait for the next driver update.
With all due respect to those guys, because they are awesome, but their current offerings are not tried and tested for PT11/mountain lion as they suggest on their site. I will post back when there is a driver update or a PT update.
Oh, i should say, there is no problem if i use a single AES card. I think the problem is the aggregate.
I know it says HDX. I've added a comment to that thread asking if it applies to PT 11 w/HD Native. No reply as yet. You might want to either that that driver update or leave a comment asking if it applies to AES cards/11/ML.