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Could you clearify why you would need two instances of the forum module?
As flexible as CBB is, I fail to see why you would need two seperate instances. The group category and forum permission structure is more than granular enough to where you could use permissions to accomplish the seperation.
I could just be missing the benefit of running duplicate forums, though. If you can explain why you want two instances, it might help us define a solution for you.
Best Regards,
James
Insanity can be defined as "doing the same thing over and over and expecting different results."
Stupidity is not a crime. Therefore, you are free to go.