Weird dark coloured glitch on KDE windows

Hello. Since a recent update (currently on 20141206), I seem to be having a weird dark coloured glitch on KDE windows only – Firefox, YaST etc are fine. Here’s a screenshot:

I hope someone can indicate how to fix this. Thanks!

I am not seeing that (with Intel graphics).

I’m guessing that it is related to the graphics card/driver. So maybe you should tell us what graphics card you have.

Also ok with Intel here.

Hello. I’m also running Sandy Bridge Integrated graphics. I was not seeing it with 13.2 but only at some point after upgrading to Tumbleweed (not sure when). Here’s the output of lshw -C display:

       description: VGA compatible controller
       product: 2nd Generation Core Processor Family Integrated Graphics Controller
       vendor: Intel Corporation
       physical id: 2
       bus info: pci@0000:00:02.0
       version: 09
       width: 64 bits
       clock: 33MHz
       capabilities: msi pm vga_controller bus_master cap_list rom
       configuration: driver=i915 latency=0
       resources: irq:25 memory:d0000000-d03fffff memory:c0000000-cfffffff ioport:3000(size=64)

By booting into earlier snapshots of a previous Tumbleweed version I found that the glitch persisted back, so I guessed something under my desktop settings somewhere under /home/myname got affected, so I just moved /home/myname to /home/myname-back and created an empty /home/myname, and hey presto on booting back openSUSE creates the default settings the glitch is there no more. All I now have to do is restore my settings. (Small price to pay for not seeing that monstrosity.)