that ThemeMagic is a part from T3 framework (
www.t3-framework.org/
). socialize running under T3 framework.
I suggest you to re-install the socialize seem some LESS or CSS files are missing.
Let me know the result.
FYI: it more safe if you must custom css at /templates/socialize/css/custom.css instead using thememagic
that joomla issue at some server.
you can changing the database type from joomla configuration > system > global configuration > server, changing it to MySQL
if you want still using MySQLi I suggest you to open new topic at here:
forum.joomla.org/