Hi,
So I recorded 8 bars of strings using Omnisphere vst. I played using a sustain pedal and all was good. I decided to copy and paste the 8 bars  to lengthen the passage to 16 bars. Everything copied across like normal except that the pedal down/up information was missing from the last 4 bars of copied data.  Anyone know how that could happen?
Cheers.

Interesting.  I tried it here and it worked well.  Try going to Edit > Copy Special and ensure that everything you can active there is checked.  Then paste special and click the Advanced button and do the same for "What to paste."

I was using SD3 and midi loops. Put one in a track while it was playing the midi data was there but it did not play. Stopped transport. Replayed. Played through without glitch.

Go to Edit > Preferences > MIDI > Playback & Recording.  Try setting "Prepare using 500 ms buffers."  Let me know if that improves things.