In the future, if you do encounter issues loading the program and you are using TurboTax online, I suggest trying to clear your cache. Many times this helps clear the browser and allows the program to work smoothly. It might also resolve some of the other issues you were having with the input.
As far as the underpayment penalty, typically it would automatically be computed when you prepared your return. However, since it was not calculated for you, you can also try contacting us under the Accuracy Calculation Guarantee. You can submit a claim and TurboTax will review the information.
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