I am currently using your Amplify theme v1 and since updating the timthumb script to version 2.8.10 any post images are not displaying! I just get a grey box where the image should be.
The post images display fine in the slider on the front page.
Have you come across this issue?
EDIT: An example post can be seen here: http://www.hobbs-style.co.uk/2012/03/hobbs-technical-team/