Strange look of the taskbar and window titles

I have a problem with the appearance of the glass effect of the taskbar and windows title.

They both look like aero peek windows with the "shadow stripes". You can see what I mean in the attached pictures. The picture to the left is how it looks on my computer.

After much troubleshooting with my Windows 7 computers I have found the source of the problem but now how to solve it.

Here is how I reproduce the problem:

Personalize -> Window Color

Move the Color intensity slider and the shadow strips appear. Even if I click cancel the damage is done..

Can anyone tell me how to get the appearance back to normal? I know this is a tiny visual problem but it is driving me mad

Thanks in advance!

/ Nicko

Vertex, I have already tried that and the stripes are still there. They are harder to see but they are there alright.

And I want the transparency effect :)

I found the solution in another thread: Remove shiny stripes on Win 7 taskbar

Weird that the registry changes just by moving the slider...