I'm not quite sure I understand. Are you saying it works fine when the Space is set to XMT or THRU, but not in THRU+C or MERGE ?
If so, my first thought would be that the Space is generating MIDI clock at the same time you are trying to pass it through. This would be easily fixed.
Please confirm that this problem occurs with the Space MIDICLOCK OUT set to OFF.
Note that THRU+C and MERGE are new features which should NOT be used in demanding MIDI setups.
