I've got two FCP workstations with Kona cards. When applying an FX Plug filter on one client, it says the video board cannot handle the filter at that frame size. Another client, with the exact same hardware will render the footage.
Only difference in systems is the problematic system is hooked up to Xsan and has a large LCD monitor attached to Kona SDI out. Other system is not on Xsan and has no monitoring.