"I'm testing my site using Opera and when I tried to post a comment on an item, it just freezes. What is this commenting problem due to?"
This is a problem with Opera itself. In the current Nucleus forms (comment-form-notloggedin, login-form, etc) the action of the form is set to #nucleus_cf. This is done to make the page jump back to the form when posting a comment (or login, etc). Apparently Opera is confused by this and sends the request to the server (the comment is posted) but then gets stuck on the current page. This can be solved by modifying the forms and removing the #nucleus_cf:
Original forum thread (thanks, TeRanEX and dis!):
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