As I am eliminating horses from the Win Contender window as I do in the process of handicapping each race, after a number of horses the following error message appears:
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I can work around this by clicking "OK" which causes the "Exit/Restart/Start Another dialog box to appear, by selecting "Cancel". This will make the Analysis>Original Screen go blank but by selecting any other tab and then selecting Original again I will see the screen as intended with the horse now down in the ITM section. As I do multiple horses I will have to repeat this process each time usually for 3 or 4 horses and then it will operate correctly.
Something that can be lived with but wastes time when there is time pressure to finish a race.