If you are hosted with Hostgator, you may have a problem with the automatic thumbnail generation feature that many WordPress themes provide. To solve this:
1. Login to your Hostgator control panel and contact Live Chat Support.
2. Ask the support technician to white list your thumbnail generation file for mod_security . You will need to give your file name and path. The file name mostly will be timthumb.php . You can find this file inside the WordPress theme folder. An example file path wp-content/themes/theme_name/timthumb.php
This is a known issue with Hostgator’s WordPress hosting and all the technicians can recognize your request. This problem will be solved by them in minutes.

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You know what? I took me almost half a day looking for the answer – DIY forum as well as Google. Little did I realize that it’s got to do with mod_security.
Thanks for such a simple solution. I owe you one, dude!
Cheers!
Wow! I was just about to start pulling out all my hair regarding this problem.
I’m using the Thesis theme just like you. I didn’t find timthumb.php in my thesis directory structure. I think the proper file for thesis is under /lib/scripts/thumb.php
In any case, you were a big, big help. I owe you one, too.
Ravi you are such a life saver. I followed what you said, with in one min they fixed the problem. Thank you so much.
regards
vj
Thanks! Was looking for this for ages
Hi Tom, Dave, Vijay, Black Wii
Glad that helped.
Hello. I ask for hostgator technical support team. for my
thumnails issue.Hostgator team cant fix my issues. Can u tell me what can i do?
Thanks Anyway.
Thanks.
I have the same problem on my local stunnix server.
Anyone can help?