Dark titlebar changes my windows' title bar color too.
Only IDE should have its own color for dark titlebar.
All windows (outside of IDE) becomes my IDE title color. I believe you play with windows native title bar APIs? If so, this affect all windows but not just IDE.

RubyMine 2017.3.2
Build #RM-173.4301.17, built on January 11, 2018
JRE: 1.8.0_152-release-1024-b11 amd64
JVM: OpenJDK 64-Bit Server VM by JetBrains s.r.o
Windows 10 10.0
Ok, How do I turn this shit off?
I've turned off 'Dark title bar' in the IDE settings and changed Windows settings but the title bar still changes when I reopen the IDE.
It may look good in the IDE but it looks like absolute shit in every other program, This 'feature' should be opt-in if it's modifying OS level settings.
@LXGaming, yeah, that was my actual intention on this issue but it gets closed :)
@mallowigi, after we open a project (after the welcome screen disappears and IDE gets opened), dark title bars comes again even if we disable it.
Yeah there is something amiss here. I will issue a fix right away.
As for being opt-in, I agree but on the other hand it would be easily missed by new adopters, and people can just disable and change it afterwards.
Thank you for fixing this.