I inserted a 2 measure midi drum clip into a track. I then stretched the clip to fill 8 measures. It plays back normally but when I go to the piano roll view only the original 2 measures are displayed. I wanted to tweak velocity in alternate measures but the notes don't show up. Is this a function of midi groove clips?

Obvious question - was it a Groove Clip?

Yes I believe it was.

Can't reproduce it.

False alarm. For some reason the Piano Roll graphics didn't update. I resized the groove clip and it cleared the problem. Some sort of temporary process glitch.