If you are updating cotonti, don't forget to update your own skin too.
This is a minor update, but is needed for the admin part.
Your changes in admin seems not to work. Only if you refresh (F5)
How to solve:
Copy all the files from /sed-light/admin EXCEPT admin.tpl.
Open your original admin.tpl.
and change it to:
Your skin is up-to-date to use with Cotonti Genoa 0.6.11