[B2RPW]

I'm having a similar problem. In my case rather than a mbox I have a tascam DM4800 with firewire card as my audio interface into PT10. But your workaround doesn't work for me because I can't see the 11 rack as an option in setup>hardware or setup>playback engine. Yet it works fine in 44.1. but when I set my mixer to a different sample rate I cannot get the 11 rack to change along with it. really frustrating.