Sry, we try to work 7*24 hours but sometimes we need some sleep....
Have you updated your Joomla version? This could be caused that the patched files are overwritten. If this is the case you need to download the lastest version of the SEF patch and reinstall it.
I mean it was working previosuly , that means when i add in the url and refresh my page it does show up.
but recently that changes in no longer there.
what can be there problem ?