pipelight/silverlight and sky go

Hi folks,

I am (almost) tearing my hair out trying to get silverlight to work on sky go. It stops on "loading plugin" and aborting will give a crash report.
So what have I tried.

Loaded pipelight from repository:- check
set pipelight to version 5.0:- check
tested with bouncing balls:- working
tested with silverlight DRM test:-working
have user agent overrider set to windows firefox 29:- check

What can I try next?

any help would be greatly appreciated

R