Midi sometimes missing when i open a project, then jumps to life

As above.
Opening a project quite often leaves me with no midi input signal until i open a VST instrument or play a track (mainly the first one).
Audio says its active but there is no life in the meter or any sound etc.
Its all set correctly, i tried Midi reset but that doesn’t help… Then if i open the instrument that’s assigned to the track like Halion and load a sound or replace one it comes to life.
No settings get changed or help. It never cuts out afterwards, its purely at the start of a session.
CB pro 11 on Windows 10.