Hi guys,
I’ve tried to replicate this in-house this morning and no joy, the audio seems to route to ST1 just fine on our MBP running Mavericks 10.9.4.
As many of the people experiencing this issue are using Mavericks can I ask you to submit support tickets by emailing support@allen-heath.com, being sure to include a full system breakdown including what model and year of mac, OS version i.e. Late 2008 Macbook Pro.
Apple had their fair share of issues around 10.9.1 and I’m not convinced that this has been entirely resolved.
On a side note, if you have a support query please submit a ticket using the email address above, we respond to tickets as a priority in product support.
@Trevor, I responded to your ticket this morning.
Cheers
Mike