When I link AVC Intra 100 30 PN  and DV Pro 1080 I 30 P and transcode to Avid DNX the clips will not play.  Even before I transcode the cip they will not play and look all blurry.

I think I found the problem.  Avid is using the Quicktime plugin and not the P2 plugin when I link the clips.  How can I get Avid to use the P2 plugin when I link the clips.

If I remember correctly Avid had their own DV codec, probably QuickTime based. Maybe someone in Avid could help with the last version of Avid that handled DV properly and what you would need to make it work these days.

I may still have an installer for a version that works and a perpetual licence dongle that MAY still make it work if that could help you.