Project settings still problematic

Trying to change the C8 Project format from 44.1kHz /32bit up to 96kHz /32bit (for mix down). Still impossible as before in C7.5: No audio output, lots of weirdness. This applies to sessions including those with VIs & FX, those which are frozen and and those which a pure audio (or bounces) only. To mix a session at a higher sample rate I still need to resort to bouncing out all the tracks or stems as audio, then loading up in a Pro Tools 96k session (which runs fine).