Flickering after 10.10.3 upgrade

I use a Mac Mini with two Apple Thunderbolt Displays.
After the 10.10.3 upgrade suddenly some random coloured bars started to appear in various random points on one of the two displays.
Moving the window where the flickering appears or moving another window over the flickering makes it disappear.
To have a look at how the flickering looks like please see this short video:
http://youtu.be/dMmtPZpNu34
I'm wondering if anybody else is facing the same problem and if there is a way to fix it as its becoming quite annoying.
Thank you!

Hello,
Same here:
https://www.dropbox.com/s/91whtdbfqszo0gq/2015-04-10%2000.56.46.mov?dl=0
https://www.dropbox.com/s/renej5dbgm6oatx/2015-04-17%2016.18.12.mov?dl=0
Are you also experiencing cold restarts? Here's another related thread: Cold restarts after 10.10.3 update.
Mac Mini Late 2012, Yosemite 10.10.3, i5 with 16GB RAM

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