wayfinder and ditto call problems

Some pages on my site refuse to render ditto and wayfinder calls, while others with the same template render fine.
problem page:
http://aiki-en.hr/
http://aiki-en.hr/corallini-sensei.html
normal page:
http://aiki-en.hr/saito-sensei.html
I did some settings changes recently and could have messed something by mistake, but cannot locate the cause.

Which version of MODx?

MODx Revolution 2.0.7-pl (traditional)

Where's the Wayfinder and Ditto call? In a Chunk or directly in the Template?
BTW, if you're on Revolution, you'd better use GetResources instead of Ditto.

Call is in the template, but same template behaves differently on similar pages.