I was using FL Studio 11 Producer Edition, but have updated to FL Studio 12 Producer Edition, I get the same issue in both versions of the FL Studio software.
I might see if I can contact Positive Grid Bias customer support next week sometime and see what they can do, cheers.
It might have something to do with running Bias on a 64Bit system.
They've just released an update which I'm in the process of downloading right now.