Variaudio has stopped working

I am using Cubase 7.5 and suddenly when I double click a track the sample editor comes up but there is no Variaudio. It was working fine a couple of days ago. Is there a corrupt file somewhere?

Did you cut/sliced any part? I had this once and when glueing all parts together and bounce the variaudio was back.

Thanks for replying. I have sorted it. Apparently if you right click on the list in left pane of sample editor Variaudio was unticked.