This SSL issue is cropping up in a number of places and the solution seems to come down to checking your own platform certificates. I am running Windows 8 and the latest version of calibre. If windows 8 is not auto updating my certificates, I haven't a clue what to do next. Not experienced enough to try the patch suggested to not validate certificates. In the meantime I have lost access to two major overdrive libraries via the overdrive plugin. Help would surely be appreciated by a number of folks.
See my post:
https://www.mobileread.com/forums/sho...&postcount=389