I got a multibridge pro and a JVC hd monitor, i'm running this on a macpro 8core.
When I make a preview in Aftereffects (1080p) and my VideoPreview is on BMD 1080i50 preview setting (there isnt a 25p preset!) than I do not have realtime previews.
the system slows down to 10fps!
I have this problem for yeas now and I just dont use the multibridge anymore because of this. But now I really need it for an important job!