[Plugin: W3 Total Cache] Thumbnail now showing at the homepage

So sorry I duplicate this question this I have posted in the “Plugins and Hacks”, because now I am really troubled. Thank you very much for your help in advance!

“I set the wp-content/ folder (including all the folders and files inside) to 777, and installed the W3 Total Cache plugin. Now the thumbnails are not displaying at my homepage.

I am setting back the wp-content/ folder (including all the folders and files inside) to 755. I hope the homepage will recover back to normal.

But what if this issue is not caused by the chmod permissions? What should I do?

Thank you very much!

http://wordpress.org/extend/plugins/w3-total-cache/ ”