Yes, I am also facing the same problem, for which I contacted the both Airtel and MX Player Team. Airtel technician visited my place and said to me that 'MX Player TV and Voot wont work on the Xstream Box', he also added that other customers also facing the same problem and It cant be resolved by his end.
After this I contacted the MX Player TV team by email. They understood my problem and shared with me few test builds. SO far, None of them worked perfectly, but problem is reduced a lot. Now I am facing problem when I use forward or back button on app.
Today also I got a new testbuild, yet to test this one.