I'm using Vuforia 4.2.3 on Android, using C++.
I'm trying to create several Virtual Buttons using the 'toggleVirtualButton' method - but I am only able to create one button. All the rest fail with log message "ImageTarget::createVirtualButton(): Failed to create virtual button."
I made sure the names are not the same, I have tried various rectangle coordinates - but came up with nothing.
Any ideas what could the problem be?