Hi! I'm with the same problem.

The app is with Vuforia 9.5.4 (Unity 2019.4.13) and this blank screen only appears in some devices like the Samsung A20 and J6.

Actually is a white plane, It should show a video on chromakey in augmented reality, but instead is showing a white plane.

What could be happening?

The problem occur when my application initialise the ARView, the view is blank i have no image and when the marker is detected, it works. the camera display the view and my 3D Models

In the first instance I think you need to go through what you have done step by step and try to diagnose the problem and work out why it could be happening and then post up your thoughts.  

Currently you are basically saying "it does not work" which makes it near impossible for anyone to help because it is at such a generic level.

N

- Yes the image sample ImageTarget works

- The problem occur when my application initialise the ARView, the view is blank i have no image and when the marker is detected, it works. the camera display the view and my 3D Models

- The problems occurs on IPhone 4 perhaps IPhone 5 but i don't know , i haven't tested yet

do you want a sample of code ? 

Please try and post as much information as you can, otherwise it is difficult to help if you have not explained the problem clearly.

Does the ImageTargets sample app work?

In which application does this problem occur?

What have you done to the code to make this happen?

What devices does this occur on?

etc.

N