Can't get sound on Fast Phonics First

Has anyone got experience of running the web based Fast Phonics First programme please.

http://www.heinemann.co.uk/fastphonicsfirst/

We have tried but the programme proper (it runs OK in Tour mode) won't run with sound. Heineman Tech Help suggest it may be a MP3 blocking situation?

I raised this question first in 2006!

Got a resolution then and the programme has been running fine and dandy since - until recently when it lost sound again.

Tried all the obvious I think, i.e. updated the FlashPlayer, added it to Trusted
Sites, enabled pop ups, tried in both IE and Firefox, etc. Still no sound?

Duh! Solved - SWGfL filtering!