I finally could work out the columns :
It wasnt the cache in my case, it was I needed to upgrade it to WP 3.5...bla bla
But when I go to page 2 of the fotos, some images are not the normal size, they seem to have shrinked.
Im not sure this is the best gallery plugin option for flickr
Anybody have a suggestion?
Check it out: 2nd and 3rd page, 1st photo wired size...