I am new here, not sure where to post this or the ettiquette here. Sorry if I get it wrong.

This week, I have bought a Sony KDL-32WD754BU TV for use in a bedroom. It is hooked up to a Sky Box and a Sony SRS-ZR5 speaker which I have had for some time. The speaker uses the HDMI 1 (ARC) socket in the TV and is ARC compatible. The Sky Box uses HDMI 2. Using options, the sound is set to the speaker.

Mostly, all is good. Using Sky, the sound comes from the speaker (which is great BTW and much superior to the TV sound). The speaker also produces the sound properly if playing music or videos either from my network or from a USB device pluuge dinto the Tv or into the speaker.  (I have no aerial access in this room.)

The probelm is the Apps. If I try BBC News, Sport or iPlayer or Demand 5 I can get no sound through the speaker. I have to change to TV speaker to get sound. However, You Tube does work ok, the sound does come through the speaker. (I have not tried the other Apps as yet).

Does anyone have any clue as to why I have this problem with the apps. Is it normal - to be expected - or am I doing something wrong?