Yeah Elena got injured on the sets a few days ago. I think she's fine now. The filming of one of the future epis had to be postponed, hence no episode this week so that they'll have time to make up for the days they lost.
Btw, watch the last part of today's CMG. There was a semi-decent break up scene between SR.
Edit: Here's the link.
[YOUTUBE]http://www.youtube.com/watch?v=0eiZ0ghwoQg[/YOUTUBE]