Midi keyboard notes missing in Cubase 5

I’m running the retail version of Cubase 5, and somehow it’s not triggering 2 notes (D and F#) in the lower octave of either of my midi keyboards (I have a microkorg 61 and an Irig Keys). It’s still an issue even when using different VST instrument other than HALionOne. I’ve tried updating to the latest driver and restarting my computer. Is there anything else I could I do?

The computer is a MacBook Pro with OS X 10.7.5