set featured image not working after site moved

Hi,

Our “set featured image” is not working after our site was migrated by our host to another server last night. When I click the “set featured image” link in the control panel, it just gives me a blank dialog box. Here’s the code from the home page (http://caspca.org – the three main event boxes under the header)

<a>" rel="bookmark"><?php the_post_thumbnail( array(287,200) ); ?></a>

and from functions.php:

if ( function_exists( 'add_theme_support' ) ) {
  add_theme_support( 'post-thumbnails' );
}

any help appreciated.

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