Post Thumbnails are not showing on the homepage.

Greetings.

I am on wordpress 3.2 and currently using U-Design 1.2.0.

Here is the problem.
The post thumbnails are not showing up at the homepage. (refer : https://awanpagi.com )

So i really hope that someone somebody can help me.

Thanks in advance.

p/s : what’s the difference between post thumbnail and featured images??