I found that in Settings->Permalinks->Common Settings if I select Custom Structure and I place
/%year%/%category%/
in both TwentyTen and TwentyEleven, this is causing me different problems like the one I described on the above post. I set back the default http://ciao-association.org/?p=123 and everything is working fine. Subscribers can leave the comments and see the full post. For now this solved my problem.
I have the same problem (http://ciao-association.org/2012/movie/)
On the home page the post is ok, but at the above link, when pressing “…Continue reading->” nothing happens.
Thanks