DSD128 and 256 now unavailable

I have been using Audirvana with a Mytek 192 DAC for some years. I noticed a DSD128 was down sampling to 176.4. I am sure it used to work. I checked preferences and see DSD128 and 256 greyed out. The DAC is DSD128 capable and I am connected via firewire.

So I downloaded latest driver for the Mytek and also upgraded to Audirvana 3. Still the same. I am on OSX 10.11.4.

What settings should I have in place for DSD128 to work. DSD64 works fine.

Any suggestions very welcome.