Problem on upgrading on elgg 1.7

Hi, I want to upgrade to 1.7 elgg version on my site (with 1.6.1 elgg version). This sites is http://redes.epesca.org. When i just make the process get the following problem.

- Icon loose reference.

- The Special characters don't show on screen.

- Problem on login (via facebook or normal login).

I show a preview of versión 1.7

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