V1.61 released 9 May, 2013 on the App Store contains the fix for this bug. Thank you for your patience.
I made a mistake in the latest (V1.60) update to Final Count Free. When you purchase an In App Purchase (IAP) that includes themes (including the pro pack), the new themes may not show up immediately in the theme picker (i.e. when you go to select your newly purchased themes to display on a timer). If this happens to you, you will need to restart the app. After restart, the new themes will be there.
What is happening is that the theme spinner on the theme picker page is only getting updated once when the page is first loaded. So if you have been to the theme picker page already, when you purchase a new theme via IAP, the spinner just doesn’t get updated. Restarting the app forces the spinner to update again.
A patch has already been submitted to Apple for review (V1.61), and hopefully I’ll have that update in the store by the end of the week. The patch forces the spinner to update each time that page is loaded.
I apologize for any confusion or difficulties this may have caused. Please contact me immediately using the contact form if you have any issues or concerns.