Issue with Amarok analyzer display

Hi all,

I have noticed that display of blocky type in analyzer in amarok (default analyzer type) has gone blank for the past few days after some system updates. Not sure after which package update/install this has happened. Though remaining two types of display analyzer i.e. Balls & Disco work fine. Any suggestions as to what would have caused this?

BTW I use 13.1 KDE AMD64 version of OS.

Regards
Ganesh