Tvheadend

Hi, just wondering if anyone can help with this -

I'm running 4.3-295 (and before this 4.3-40) and I can't get channel links to play from the web GUI of TVH in VLC. If I click the blue "play" link in TVH next to a service in the "Services" tab, a mux in the "Muxes" tab, or one of my mapped channels in the Channels menu, I get an error message similar to the following when it opens in VLC -

The format of 'file:///C:/Users/Adam/AppData/Local/Temp/61d143cd9746022b4cf55ca79a37854d.m3u' cannot be detected. Have a look at the log for details.

I've attached the m3u file for the example I've just given.

If I open any of the links manually in VLC and remove the "/play" to get just the raw TS, it works fine -

e.g. http://192.168.0.224:9981/play/stream/mux/61d143cd9746022b4cf55ca79a37854d?title=10719.25V%20%2F%20Eutelsat%2013 --> http://192.168.0.224:9981/stream/mux/61d143cd9746022b4cf55ca79a37854d?title=10719.25V%20%2F%20Eutelsat%2013

This all used to work fine until I upgraded to 4.3. Does anyone have any ideas of what's going wrong?

Thanks!