First, try deleting all files in the core/cache directory and clearing your browser cache *and* cookies.
Well, it seems there was something wrong with my snippet tag, as I tried this one and and the text showed up: [[!getResources:default=`No results found`? &parents=`[[*id]]` &tpl=`myRowTpl`]] So that meant the extra was working. Playing with values for the &parent part did the trick, and now it is working.
I'm glad you got it sorted.