In many cases this is the problem of Personal Firewall products. Personal Firewalls tracks Feedreader application file size. If new version's filesize has changed (and it changes in most cases) then Firewall will disable Feedreader's internet access.
For example if you want to add new feed to Feedreader then it says :
Error adding feed: Socket error : # 10061
This error message means that Feedreader cannot access internet.
So please check Personal Firewall setup and reenable Feedreader to access internet if needed.