Play to option gone

Sorry if this has been covered before but i'm having a problem with the Play To option when you right click the video file on the server system . In my case it's no longer there, the same file can still be played if its selected using the tv (sony bravio) but I can no longer send the file from the computer to either of my sony tv's.
Any help would be great .
Thanks

[zip]

That's a function of the OS I think.

Yes as serviio is still working fine on both tv's im assuming its the OS as well Windows 7 ultimate 64.
I can't work out why the option is gone as it was working fine one day then not there the next.
Could it be a network change that's making it hard for the OS to find the TV's ?