Fit to time.
Just tried this in X1 for the first time and all my notes (MIDI) disappear.
Same thing happens in 8.5.3.
Works in 7.02!
Studio: X1P on Q9550 @ 3.4Ghz P45 8Gb DDR3. W7 x64. MOTU 1296, 2408 Mk3. TC-Helicon Voiceworks. BCF2000.
Stage: Cantabile Performer 2 on E8600 @ 4Ghz P45 8Gb DDR2. W7 x64. 2408 Mk3, TC-Helicon Harmony-M.