Scroll bar image does not work in UI path orchestrator

Friends, I use an application. At one point, I use click image activity to scroll down the screen. It works perfectly while I run the app manually. The same concept does not work (the image activity is skipped) when the app is running using UI path orchestrator. I checked the forum and changed the screen resolution and resolution depth from %ProgramUser%\UIpath but it does not help. Please provide any other suggestions. Thanks.