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Ecco, la solita scettica, direte voi. E' appena arrivata la risposta al mio quesito da un gentilissimo user che si chiama nitecruzs e che io ringrazio molto anche se non ho capito una mazza di quello che mi suggerisce.
Aiuto ! Qualcuno di voi riesce a decriptarmi questo messaggio che, se non fosse per dei caratteri riconoscibili, potrebbe essere stato scritto anche in mandarino cinese ?

Riporto :

If your blog has an embedded form, and you (or your Followers) report
problems posting comments, you (they) have a problem
with authentication, and with cookie filtering.

The best solution would be for you (your Followers) to enable
(stop filtering) "third party cookies", in your (their) browsers and
computers.  Short of that solution, change your blog to use a full page
comment form.

You can have a cookie filter:
1. In a native browser feature.
2. In a browser add-on.
3. In a security feature, on the computer.
4. In a network device.
Please, note
that any and all cookie filters must be set properly.  If you (your reader) has more
than one cookie filter affecting access to Blogger, all filters must
be set properly, before an improvement will be seen.

Try the commenting / cookie test, by commenting on 2 of my blogs, if you like.

Read, for details:

Comments Disappear, When "Post Comment" Is Hit: