Task item in KDE changing color

[Yora0]

Sometimes items in my task bar change color to white. Sometimes it happens when something has changed in that window, but sometime it happens just by my mouse pointer moving over the item in the task bar.

How do I make that stop?

[rdieter]

With the default plasma theme (and with desktop effects enabled), the panel is a bit translucent, so anything that changes color behind it, will affect it's appearance.

[Yora0]

But that's not the problem.

Using the Oxygen theme, the panel and all the items in the panel are black. When there is some activity in some windows, the panel item will turn white and only go back to black when I make that window the active window and switch back to the one I was using.

I don't want the panel item to turn white at all!