Thanks for the feedback, creating a fresh project and setting up the AR camera, then copying scene across the custom markers are working fine! 

So I suspect the issue was as suggested that the datasets where being overwritten in the samples script as I was based within the ImageTargets example.

Hello deprogram,

Are you running your custom targets within the Core Samples? If so and you are running the main menu scene, please note that the samples modify the loaded datasets via code and this may be overriding your datasets being loaded.

If you aren't doing this, please share the log output of your app session so we can verify there are no issues.

Thanks,

Vuforia Support

I'm assuming no errors in the Unity console.  Not sure what's going on.  Maybe try starting from scratch in a new project, setting everything up and just placing a simple cube on the image target.  You didn't specify the exact version of Vuforia 7.  I don't think older version of 7 will work in newer versions of Unity, make sure you are on the latest version.  

Yep the custom database markers are ticked, and acticated on the AR camera.

Xcode outputs only console messages for when the sample markers when they are found/lost...

When running through Unity though the webcam has no problems picking up the custom markers, so it seems the issue is when building to devices...

Double check that you've loaded and activated your databse in the Vuforia Configuration?

Do you see anything interesting in Xcode console while debugging on device and pointing at an image?

You should see a trackable found message in the console.