This is actually my first time using wordpress in a server. I chose athahualpa as my first theme, it worked fine on my first webserver (actually a paid one). Most widget are working but when I tried adding widget to athahualpa on my other server (i use a free webhost byethost and it use fantastico to install script) the widget doesnt show up. The built-in widgets like the 'calendar' and 'categories' work ok whenever i deactivate the new installed widget. Also I didnt see the 'add' button in my byethost athahualpa, its like 'drag and drop' kind of option. Does it have something to do with byethost php version?

Thanks in advance

What version of Atahualpa, WP and PHP?
what widget are you adding?
Drag and drop functionality are a wordpress feature - nothing to do with Atahualpa
What is the url?