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[bottan]

When some guest, or registering wants to see a photo leaves the following message “Was an error when processing the consultation”, but it does not happen the same with the “administrator”.

Néstor

[Joachim Müller]

Turn on debug_mode in Coppermine's config for everyone, then try as guest and post the actual error message (the query that fails) here. Do not post debug_output. Leave notices_display turned off.
The english word is not consultation, so you appear to be running another language than English. Before trying to replicate the error message and pasting the message into your posting, temporarily switch to English to make us understand it. To do so, access your site with the url parameter lang=english, e.g. http://yoursite.tld/your_coppermine_folder/?lang=english. Reset the language later by accessing http://yoursite.tld/your_coppermine_folder/?lang=xxx