Strange indeed :) Are you sure you're not messing with audio vs. MIDI track exports? Remember, audio export only applies to audio tracks and clips, only. The same prediction applies to MIDI tracks and their respective clips. Is that your case, all strictly MIDI tracks and clips? Did you manage to create more than one MIDI output bus? Mind that export only takes effect on tracks assigned to one selected export bus, either MIDI or audio. Are all other tracks muted but the one you want to export its contents?
Strange indeed :) Are you sure you're not messing with audio vs. MIDI track exports? Remember, audio export only applies to audio tracks and clips, only. The same prediction applies to MIDI tracks and their respective clips. Is that your case, all strictly MIDI tracks and clips? Did you manage to create more than one MIDI output bus? Mind that export only takes effect on tracks assigned to one selected export bus, either MIDI or audio. Are all other tracks muted but the one you want to export its contents?
Yep, too many questions; maybe just one answer :)
Cheers