On Monday 13 of July 2015 20:45:12 Felix Miata wrote:
> http://fm.no-ip.com/SS/KDE/tccSounds-jessie-gx780.png
>
> It bothers me that the play a sound icon is always gray, but it's both
> working and gray in KDE3, while all other panel icons in both KDE3 and TDE
> have some color other than gray.

Click to the Player Settings, select the External Player, enter 'artsplay' and 
try if notifications plays.

-- 
Slávek