Thumbnails don't show

Hello!

I am in need of some help. The website is https://www.erythrinasjewels.com and I am using a Simplicity theme I purchased from Woo Themes. My problem is my slide show image, my thumbnails in the portfolio in the home page and the thumbnails in the portfolio page itself does not show. I have updated to the latest WP framework. I have updated the thumb.php files also. I have set 0777 to my uploads folder and the folders in it. My functions folder is in 755 and the thumb.php as well. I have communicated with my server administrator also and he said that the thumb.php seems to be working but still no thumbs display. I have raised this issue to Woo Themes and they replied that it is out of their scope as they give support to those issues related to their themes. Please help. I’ve been so stressed looking for an answer. Thanks in advance.