Can you please go to your Help -> About screen and click on 'Copy To Clipboard' and post those details here?
Also, can you give a little more detail as to what you were decrypting. Was this a file you encrypted with your own key that you created in OpenPGP Studio? Or was this file from a trading partner with which they supplied you their key for decryption? Is the file encrypted and signed, or just encrypted?
Please provide more details when you get a chance and we'll do our best to assist you further.
Thanks - Jon