I have been able to use GNU just fine for Encrypting, and Decrypting. Now today after encrypting some photos for a review. I can no longer decrypt photo's or even my .txt files. So anything with two step authentication I cant get it to. I hit decrypt and it doesn't even prompt me for my password. It just says "Wrong passphrase!" I have delete the keys and re-imported them, still a no go. Any help would be great.
Try importing your private key into a different PGP client to see if something has become corrupted in GPA:
http://www.gpg4usb.org/
Video guide:
https://www.youtube.com/watch?v=EopEoVr1b2U
Guide:
https://securityinabox.org/gpg4usb_portable