Is it supposed to work? I'm trying to output to two DisplayPort monitors using the two Thunderbolt ports on my Late-2014 iMac 27 inch, but I can only get the first connected monitor to be seen, plugging a second one only gets it ignored. The official documentation for this model mentions support for two simultaneous Thunderbolt displays. I'm guessing that it only works if they're specifically Thunderbolt monitors or something? That's a real bummer if true... Does anyone here successfully use two DisplayPort (not Thunderbolt) monitors on this specific iMac model?