Maybe you can solve this problem by checking this thread: http://forums.appthemes.com/ad-image-zoom-broken-upgrade-wordpress-3-a-15371/
Maybe you can solve this problem by checking this thread: http://forums.appthemes.com/ad-image-zoom-broken-upgrade-wordpress-3-a-15371/
There are a few existing threads on this which provide some solutions http://forums.appthemes.com/fatal-error-help-mb_strlen-18313/