session & languages array.

I have a very strange problem, and i don't seem to figure out what is wrong. I start a session, and register $_Session['Idiomas']; then i go to another page and select require("/lanugages/".$_Session['Idiomas']."/main.php") to require the text array to display text. Now here comes the weird thing... The first time I enter a page, it loads perfectly, then I go to another page, use the same exact sintax coming from the exact same directory, and the second time, it doesn't shows the variables. I was wondering if by initializing an array it stats up during the whole session, and then the second time i require it, it conflicts... but I dont have a clue about what is wrong. please help vamp.