Suddenly found, that can't see comments for submited contributions. Comments numbers is displayed well, but clicking on it shows only new comment form.
I've checked Opera and Mozilla, with mantainer rights, and by regular user.
Confirmed. This seems to be a regression due to a recent change in Moodle core. Already reported as MDL-27262. I have applied a temporary solution for this portal. Please check if you can see comments now.
Thank you, now all is ok.