Actually, seems like the upgrade of the gnupg package from 1.4 to 2.1 is the issue (gnupg:armhf (1.4.20-6, 2.1.14-5) ).
Just reinstalled the old 1.4.20-6 version for the gnupg package and things work nicely for me again. Anyone having an idea why gnupg2 might fail for me? Regards, Linus