A problem puzzled me a long time. The test report has been attached.
I have a case which is used to capture the screen shot of one web page every minute.
But after 10 minutes, it will encounter an issue: Window is inactive and cannot be activated.
TestComplete requires that the application's GUI be drawn to work with its objects. If the application's window is minimized or "overlapped" by the screensaver, the operating system does not draw its GUI so TestComplete cannot “see” the tested application’s interface and thus fails to interact with it. So, you need to switch off the screensaver when running your tests.