Default HDMI fullscreen issues android 4.3

Hello

Ive updated my toshiba excite pro to android 4.3 and cant get the HDMI connection to the TV to go fullscreen. It is also definitely not showing at HD resolution.

There are vertical black bars on each side of the screen, there is also no HDMI menu in the settings.

Is this an issue with this version of android, or are there any ways I can fix it?

Any input would be much appreciated.

Thanks