Activating makes site blanck

Hi.
Activating makes the site and admin fully blanck.
Being used in other sites in different servers without problems, I’m trying to use it as a replacement to Qtranslate because uses the same tags and good approach for user side.

Installatio: Plain new WordPress
Plugins: All deactivated
Theme used: Any wordpress standard

Any server configuration that you may know that could interfere?
Thank you 🙁