[Plugin: WordPress Related Posts] ver 1.2 doesn't show post thumbnails

I use WP2.9.2 and I upgraded the plugin from 1.1.1 to 1.2
After updating, suddenly all post thumbnails that were shown near the related posts are not shown anymore !

I downgraded again to 1.1.1 and the thumbnails appear back.
I’d be happy for your assistance.

Thanks,
Maor

http://wordpress.org/extend/plugins/wordpress-23-related-posts-plugin/