It's been a year since i started to use Zen-cart,everything was fine until one day i found that when i finished editing the Define_main_page.php, i clicked save. And everything looks normal,but actually it didn't take any effect while i refresh the main page.

This is really weird, can anyone help me? BTW,the other define page like "contact us" works fine.

My site url: www.seeedstudio.com/depot