Hi everyone,
 
I've been working on a sequence/multi-track in Sonar Platinum that I created on an older PC some time ago. When it loaded up it couldn't find any of the synths apart from TTS-1 as I had stored the PLAY instruments on the newer PC on different drives. I loaded them again and fixed that problem, but I am unable to change the output of the Master bus. The old PC had a different audio interface and when the project was loaded it recognised that fact as well, of course. The master output is currently being sent to the first two outputs of my Fireface UCX interface but I want to change that to the first ADAT output. Clicking on the output assigning button does not bring up any options at all. All the inputs and outputs that I want to use from that interface are listed in the Audio Preferences and ticked (i.e. should be available for selection but are not). Any suggestions?

Delete your master buss and recreate it. That usually works.
 
Obviously you'll have to re-route the busses feeding into your master buss but that should only take a few seconds.

Thanks Bristol_Jonesey.
That fixed the problem but actually all I had to do was delete the master bus and it instantly recreated another and now I'm able to change the output.
Cheers.
Bernard.