I'm sorry but now I'm more confused.
First: About the module positions, you tell me menu1 is only for sub elements, but the only menu positions I got are menu1 through menu10, no "mainmenu" position, I've set my other sites on menu1 and they work fine. I'm lost starting from this point.
Second: You are telling me to have exactly 3 menus with the following descriptions.
Main menu, with all items, every item set to "all" languages.
Menu 1 with one element as default for one of the languages, in this case english.
Menu 2 with one element as default for the other language, in this case spanish.
If that's what your telling me, I did that but it's not working yet, and why it didn´t happened with my other sites?
What I had read before was that I had to have a main menu with 1 item set as default home page and "all" languages. One menu for english with my english content and another menu set to spanish with my spanish content. That work for me with Joomla 3.0 but with Joomla 2.5 I had to have one main menu unpublished and another menu with all content, each set to it's respective language.
I will send you in a private message the address of another site I have to show you how I have it set up. It's working fine.