I am having an issue where when I have the AJA IOHD running my internal and external hard drives lag when I go to open them the first time after system boot. Also, when in FCP if I leave the machine idle for a min. or so I get a 30-1min beach ball and then playback of my timeline can resume.
I have had this issue with the last few versions of the AJA firmware and the OS has gone from Leopard to Snow Leopard with the same result.
I also have the GSpeed ES with ESATA Card hooked up.