My site http://www.tricky-photoshop.com
I have a peculiar problem with my website. I have created an "about" page for my website and it was working fine few days ago. But now with the same URL, my theme is showing "page not found". For example suppose I have set the URL of "about" page as "abc.com/about" and then publish the page but when i type "abc.com/about" in URL box in my Google Chrome then my website shows "page not found".
Same thing also happens with all the links in "top navigation panel(except home)"
PS it only happens to page not with the posts. I also checked the http://codex.wordpress.org/Using_Permalinks page and couldn't find the problem
I am a beginner and don't understand the advanced coding language