Can someone answer this one please? Same for me. I'm on a Mac 10.8.4 using Firefox version 22. Up to date Silverlight is installed but it is obviously not recognised. Extremely annoying.
Thanks MarkUK but I've already done that four times in a different order each time. Everything is up to date but something must be incompatible. Surely BT would have sorted DRM before launching... but then again!
To solve this problem in internet explorer
Go to tools - Internet options - Programes - Manage add-ons
Then look for silverlight you will probably find it is disabled
Now highlight silverlight and click enable
you should now be able to watch BT Sports