I've asked about this elsewhere to no avail, but just in case someone here has experienced this and knows the solution...

While recording MIDI into PT, sometimes the sustain goes away even thought the sustain pedal is fully depressed. The information is recorded correctly, however, and it does play back flawlessly - but it's a groove buster to have it happen.

I'm on PT 7, Mac Dual G5; other guys with newer versions have experienced this as well.