Flash suddenly stopped working in Firefox

Hi
Over the last month or so I've updated Firefox and Flash a couple of times, and at some point flash stopped working and no longer loads videos. For example videos on youtube, or bbc iplayer don't play. I'm not sure at exactly what point it stopped working, and therefore don't know what I could undo.
In firefox plugins page flash v16.0.0.235 is showing up as installed and always active.
I've tried uninstalling both firefox and flash and then downloading new installs and reinstalling with no change.
I've also tried Mozilla's list of troubleshooting suggestions to no avail...
Flash Plugin - Keep it up to date and troubleshoot problems | Firefox Help
Firefox version 34.0.5.
I'm running Win 7 pro 64-bit, fully up to date.
Any suggestions would be gratefully received as I am drawing a blank and don't understand why a fresh install of both programs doesn't fix the issue.
Thanks in advance!
Tom

For anyone interested, I tried installing previous versions combinations, and for once it seems that it's Firefox where the problem lies.
If I install Firefox v33 and Flash v16 then videos work fine.

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