Hi Ofer,
I have two assumptions:
1. The object you are trying to highlight is overlapped by another window or component, so TestComplete fails to highlight it. Make sure that the needed control is completely visible on the screen and try again.
2. The object you are trying to highlight is mapped, and there are several objects that match the name mapping criteria specified for this object. So, TestComplete finds the first object that matches these criteria, this object is invisible on the screen, that's why, it cannot highlight the control on the screen.
