Andreas04 is a 3 column theme (header, sidebar top, sidebar left and sidebar right) that best fits my needs.
I customized it in WP.com and is working fine there, but when I tried to use it in my paid host the right part of it (that is the sidebar top, sidebar left and sidebar right) didn't show up at first and therefore didn't show up either the widgets I have there.
I'd understand that a theme that works in WP.org doesn't work in WP.com due to the WP.com limitations, but not the opposite.
So I installed in my host version the theme's CSS code I got in WP.com and the sidebar top stuff appears in place, but the space reserved for sidebar left and sidebar right remains empty.
Does anybody know a way to solve this problem?