In the Update Portfolio window, what does checking ‘Adjust Cash Automatically’ do?

When you adjust cash automatically, Stock Rover assumes you are buying stocks using the cash in your portfolio. So if you add shares to your portfolio, Stock Rover will subtract the cost of the shares from the cash position. Likewise, when you sell shares it will add the cost of the sale back into the cash position. If you do not check this box, you will have to adjust your cash position manually.