The playback of scenes with pan or scroll is jerky/stuttery. I know it's not the source file as they all play fine in QT or via Avid.
I'm using Adobe Premiere CS6 with Kona io xt on a Macbook Pro running 10.8.2. My studio's rig display the same behavior, Z800 win 7 with CS6 and Kona 3G. I use a broadcast monitor with HD-SDI.
This is most likely a Premiere/AJA integration issue.
I tried different playback settings in PP, they all yield the same result...for example, this particular file is in 1080psf @23.976, codec is DnxHD, i have the playback set at, 1080p23.98 custom with DnxHD codec. playback is still stuttery.