Since I upgraded from Lightroom 4.0 to 4.1 the flickr export plugin doesn't work any more. The same flickr set could be published with LR 4.0
The error message is: the flickr webservice could not be reached. check your internet connection.
I can authenticate my flickr account via Lightroom 4.1 and I can view the contents of my flickr account.
My system is Windows 7 Home Premium (64bit) SP1.