I just installed the latest minera image onto a new pi b+ I bought and I'm experiencing the php/layout issues that others have recently mentioned. This is off of a brand new install and the errors are visible on multiple devices even after clearing the cache. These errors make it impossible to configure minera.
I also updated another pi from 0.6.0 to 0.6.1 and now it's useless because of these issues as well.
Please try now.
To fix it definetely at your side, please update the Minera code:
cd /var/www/minera
sudo git fetch --all
sudo git reset --hard origin/master
And you will not see them anymore.