Screen blanking during call - Galaxy S4

Greetings
I have BT Smart Talk installed on a Galaxy S4. Installation went OK and application appears to lauch perfectly. When attempting to make a call, I can dial the number but immediately I press the green "phone up" button at the bottom of the dialler page, the screen goes grey (not black - unlike with a normal call) and there is nothing displayed at all - a completely blank grey screen. I can continue with the call, but I cannot end the call and none of the buttons on the phone seem to work while this app is controlling the phone. If I drag the screen from the top, I momentarily get the "end call" screen, but it is desensitised and the red "phone down" button does not work. The only way I can end the call is to power off the phone. I have tried deselecting "Turn Off Screen During Calls" in call settings but this makes no difference to the BT App - only to the phone's own dialler. Any thoughts?
Richard

Hi rjmeado,
This sounds like it will need to be looked at by the Smart talk team. Please use the 'contact the mods' link in my forum profile under the 'about me' section to send in your details and we'll get this investigated further. You can find the link by clicking on my username.
Thanks
Neil
BTCare Community Mod
If we have asked you to email us with your details, please make sure you are logged in to the forum, otherwise you will not be able to see our ‘Contact Us’ link within our profiles.
We are sorry but we are unable to deal with service/account queries via the private message(PM) function so please don't PM your account info, we need to deal with this via our email account :-)
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