Weird MIDI Problem

I am using PT 11.2 in Windows 7/64 with mBox2. I just upgraded from 8.0.5. For whatever reasons, every note I record in MIDI, except the first one, is very short, as if I was playing it staccato. I know that that can happen if you record one note over the other but this isn't the case. It occurs on a fresh record and always with the second note or chord. I am stumped. Thanks for any help.



Basil