Avast 2015 update issue on windows 8.1 Pro x64

Hello

My name is Dominik, I have encountered an issue with the Avast 2015 update, as soon as I have updated to the latest version (Avast 2015) literally like 20 minutes ago.
My device is Toshiba Satellite C850-19z using Intel HD graphics card. I have a second monitor plugged in used as my main display.

Just after updating Avast to the 2015 version and rebooting the computer, the built-in display on my Toshiba started to misbehave. Every 25 seconds the brightness would increase to like 100% and then decrease straight away to the previous level. Type of like some pulse signalling by the display, I have reinstalled the graphics driver, restored the brightness settings to default, reinstalled Avast, but still no difference. I am not sure what else could I do, also it is a new update there is a chance of it having some bugs, therefore I thought that it would be a good idea of letting someone know about this problem.

Although when I have removed Avast completely from my computer, the issue have fixed it self. I am not using Avast at the moment, but would like to continue using it, as I am very devoted to this program and been using it since my first computer.

Thank you
Dominik

https://forum.avast.com/index.php?topic=157668.0