What I notice when looking at the page "Infantil" is that it is completely blank, even though it contains normal wiki text that should be shown in any case. There seems to be a problem that is not just about SMW queries here. You should try to remove the query template and check if this actually changes something. And (if the template is still suspected to be the cause of the problem) you should experiment by using the template with a fixed pagename instead of {{PAGENAME}} (does the Infantil page work if you use "Primaria" as a page name?). Otherwise, you may also try and remove some of the other text or templates and see when the rest of the text re-appears.

Another way of debugging such problems is to de-activate extensions in LocalSettings.php and see what happens. This can help to find out which of your installed extensions causes the problem (if any).

Problem can't be verified for SMW 1.9, apparently mentioned examples don't use SMW therefore we close this issue.