Please check if Flickr.com services are available within your region. Also if you are shown offline then it is probably some issue with flickr.com services and not PSE.
Try sending photos from browser for double check if you are able to use flickr.com services apart from PSE application.
You can try refreshing online services from Organizer under Edit->Preferences, Adobe partner Services. Check if your correct location is chosen there. try refresh and other appropriate settings as per your need.