We just started a project using Adrenaline HD with DNXHD-36.
Based on posts I had seen about issues with MXF audio compatibility, I decided to split the audio off to it's own workspaces, using the OMF/AIFF format instead of MXF. The problem is that if you are in a DNX project, the Avid only refreshes the AVID Mediafiles directories, NOT the OMFI Mediafiles directories, leaving new audio offline. This is a known bug.
The workaround is to create a SD project and switch to that once you have imported/copied your audio files. This will update the OMFI Mediafiles directory, at which point you can switch back to your MXF based project and use your new media.