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Good question. I don't know since i am not sure what the cause is and it has been pretty reliable. Also, you can contact their support, but it is off on the weekends I believe.
Is your resolution too low and your screen is cut off?
If yes, then find a way to increase the resolution or hook up an external monitor
If No, try rebooting
If does not help, reinstall the software
If does not help, try reinstalling Java - I think it requires Java
Finally... find another computer I guess if nothing helps

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Hello ,
I have same problem , where NEXT Button was not seen . but found a solution finally ...
Here is what you have to do:
1) Go to Display Settings (Control Panel\Appearance and Personalization\Display )
2)Change the size of all items from large to smaller (apply and save)
3)Restart your PC.
Now launch GMAT Prep , you will be able to see GMAT Prep screen completely.
In case if the size of GMAT Prep Screen is too small , just adjust the resolution according to our comfort.
I hope this will definitely help you.
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