Mainstage 3 quits when rewire

I have been using Mainstage 3 to play live, and I rewire to Reason 7 as sound source. I didn't have any problems up until I updated Mainstage to their latest update a few days ago. Ever since, every time I start Reason right after started Mainstage it will stop responding and will crash just a few seconds later. This is not good for me at all because I use Reason sounds more than anything else, but Mainstage workflow is just perfect for live situations. Is anybody else having this problem out there? I just want Apple to fix this with a new update or something.