Streaming from Channel 4 and Channel 5 (only) in UK problems
Flash Player version 25.0.0.171.
Windows 7 SP1 (x64) fully updated
Internet Explorer 11.0.9600.18665, update versions 11.0.42
Streaming from other TV networks in the UK works fine including BBC, ITV and even NowTV but the above two networks (All4 and My5) will not work to playback any TV shows with the above combination. I get similar errors with each relating to Digital rights error 3343 on All 4 and My5 (see respective screenshots attached in order)

This is an i7 6700K based PC which is only about a year old and I've even formatted the SSD and performed a totally fresh OS reinstall with no difference so I know it shouldn't be anything on my PC that's responsible. Any idea what could be causing these problems please? Contact with the respective channels web support/customer services depts. has only resulted in suggestions to reinstall the newest version of Flash Player and to clear DRM caches etc but this is a freshly reinstalled PC so these suggestions don't apply. The strangest thing is that other channels work fine using Flash Player without generating any errors.
Any suggestions or ideas for getting to the bottom of this 3343 issue please?
