I have an app that was working fine until I added both Object and Image Target data to the scene. These are not being used at the same time. They are not even in the same scene. Once the app is started it randomly will not load anything but a black screen. I can close down the program and start it again and it will work just fine. Then after a while I will load the same scene and won't work again.
I am not using cloud reco. I have paid for the $500 target device based version. I am using Unity 5.3.3 and Vuforia 5.5.9.
I have read about other black screen issues in the past but these are all old. I have verified just in case that all settings are set to their fix to be on the safe side and yet it still does the same thing. It is not consistent. Sometimes it works. Sometimes it doesn't.