Ya..Thank u...Its now working...I removed W3 TOtal Cache...Now all working properly...

You should not remove whole plugin. Caching plugins do a very good job. just disable CSS/JS file minify functions and disable cache for logged-in users. That would be enough to make those compatible.

I am already using cloudflare free Ip hosting...That is good or need to install w3 cache?

and I trying to change Forum title color using css...but not working..can u say me which code to use...I used this one..

#wpforo #wpforo-wrap .wpfl-1 .wpfl-2 .wpfl-3 .wpforo-forum-title {color:blue!important; }

I tried color: blue , color:#ooooff , color:#off..But nothing is working..can u say?

Your CSS is wrong. Here is the correct code:

#wpforo #wpforo-wrap .wpfl-1 .wpforo-forum-title {color:#DD0000; } 
#wpforo #wpforo-wrap .wpfl-2 .wpforo-forum-title {color:#00DD00; } 
#wpforo #wpforo-wrap .wpfl-3 .wpforo-forum-title {color:#0000DD; }