Since the program will put Bluestacks into the foreground for Tesseract to read, it's best you drag the program to one side where it won't be obstructed by BlueStacks. You have to zoom out all the way and click attack before you press Start. After you pressed Start the function will run until it find a match and you cannot stop it with button or close windows. Press Shift+ESC to force close the program. Can you try again and let me know how it goes?