I am running DP 11 on Sequoia. When I assign Kontakt or Kontakt 7 to an insert, it doesn't see any instruments. I suspect the files need to be relocated, but I don't know where / file system location.
If you are having problems then first check in standalone version first.
Also you are supposed to be using latest version of Native Access for your OS
Else ,as far as I know then in kontakt 7/8 then you are required to locate/setup in Native Access first and then run Kontakt standalone afterwards. Thus you first need to makes sure that everything is OK and set correct in Native Access , if you then need to rebuild the Native Access db then reset the N.A. XML (links below here) , if you then need to reset the Kontakt DB then do that also , then run Kontakt as standalone. You could possibly also have to reset your DAW or rescan for plugins but I am not sure about that.
If you need to move , relocate or reinstall then please also see links below here.
Resetting the Native Access XML file ,look at section 8 here : My Product is Missing in Native Access
Reinitialize the KONTAKT Database
Reinstalling a Komplete Bundle Without Re-Downloading Kontakt Libraries
Moving a Native Instruments Product to Another Location on Your Computer
Using the Repair / Relocate All Function in Native Access
