Adobe Illustrator CC 2015, 2017 have unnecessary border in pop-up windows

Hi.

I have this issue all the time since I move from Windows 7 to Windows 10. Any pop-up window have a border

I find that if double-click on this pop-up window the border disappears. But it's not a solution at all. Not to mention that it is annoying very much, I think the companies like Adobe should care about such thing more then they do right now.This bug reproducible in all versions of Adobe Illustrator CC 2015 and in the last CC 2017.   I'm just curious nobody at Adobe sees this bug? I watch YouTube channel Adobe Creative Cloud and this is the video where this bug also appears: Live Illustration with Maite Franchi - DAY 1/3 - YouTube​.

Computer configuration:

Radeon Software Version - 16.9.2

Radeon Software Edition - Crimson

Graphics Chipset - AMD Radeon HD 7800 Series

Memory Size - 2048 MB

Memory Type - GDDR5

Core Clock - 860 MHz

Windows Version - Windows 10 (64 bit)

System Memory - 8 GB

CPU Type - AMD Athlon(tm) II X2 255 Processor

Thank you in advance for any help with this issue,

Maxim.