Yosemite load bar color changes / from black to white

Hello there,

is anyone experiencing the same as me?

When booting my MacBook Pro Retina Mid 2012 the load bar color changes from black to white. The color change happens as the keyboard background lights turn on. After this I get to the login screen with the blurred desktop background image (seems normal)

Video: https://vid.me/hOX

(sorry for the vertical video)

I know that the load bar is a feature of Yosemite, but not with the color changes.

I did a clean install of OS X Yosemite with the AppStore download and the Diskmaker X Tool.

Thanks for answers...