If you are having an issue with unlocking the full version of the app after having purchased it, try to: kill the app from multitasking, return to the app, get to the prompt to purchase the full version, but this time select Restore. You will not be charged twice because of this glitch impacting a small percentage of users.
If you have any trouble at all with Options Profit Calculator, please feel free to send an email to firstname.lastname@example.org. Helping me understand the inevitable bugs in my app is better than simply leaving a negative review.
That is also where you can submit feedback, suggest improvements/features, or just say hello.