Airplay Video not working on certain apps

Hi,

I've just bought aTV Flash (black) - great product! I'm on version 4.4.4

 

Most things seem to be working perfectly. However, one thing I don't seem to be able to get working is airplay video mirroring on certain (non-apple) applications that previously did allow video mirroring - for example, the iPad lovefilm streaming app.

I can get airplay video mirroring to work for standard iPad apps such as youtube and Videos. However, for non-standard apps that do have video airplay enabled, all that appears to be sent across to the appleTV is the sound. No video is sent.

 

Any ideas why this might be the case? Am i doing something wrong?!