Turning off vsync "fixes it", but now I have tons of screen tearing.

Hello Raklar,

The recommended OS for Cylne is Windows 7 (the minimum OS are Windows XP SP3 or Vista). It's related to the UDK engine I use (which is now UE4).

Here, the flickering shadows problem may come from Windows 8.1 (probably between W8.1 and the graphics card). A solution could be to run the game as an Administrator and maybe to enable compatibility mode for Windows 7 :

For that :
- Right click UDK.exe in
C:\Program Files (x86)\Steam\SteamApps\common\Cylne\Binaries\Win32
- Select Property
- Select the Compatibility table
- Check "Run as an administrator" (it's below)
- Maybe, check "Run this program (...)" > Select Windows 7
- Press "Apply" and "Ok"

Regards,
-Cylne.

I use Windows 7 and I allso have flickering "dark bars" in the main menu with vsync on. Vsync off fixes it but as Raklar says, this results in horrible screen tearing.

I played it a year ago and I don't remember the game having these problems back then. Did something change in the nvidia drivers that messed up this game?

BTW, the water effect in chapter 2 is also flickering on and off. It really ruins gameplay.

Hello Owowg,

What is your graphic card ? I don't have this problem with Windows 7 and a GTX 750 Ti (with driver updated : 9.18.13.4752, 02/05/2015).
Do you have this problem with other games made with UDK engine (such In Verbis Virtus, Dream, mind path to thalamus (first edition), NaissanceE...) ?

Regards,
-Cylne

Since it was related to screen refresh rate I tried to fix that manually. It didn't work. I can't even select vSync ON or OFF. I also tryed to disable G-Sync and it didn't work.
I've been palying NaissanceE smoothly.

Anyway I've found a workaround using G-Sync monitor settings:
Screenmode: windowed
Resolution: Whatever you like
G-Sync refresh rate: 60Hz*

*you have to cycle them, it means you have to change to 60 whenever you see black flickering.

It could be related to refresh rate exceeding 60.

Tested on:
Win 10
nVidia 980ti
driver v. 391.35
G-Sync monitor 144Hz

Yeah, have that issue too (Windows 7, GTX1080). Though since there's a fair amount of tearing, I assume my Vsync is already off... Also, the lack of a "borderless window" mode is just criminal. :D My display takes ~10s to cycle through inputs (nope, can't disable them), so each time the game starts (or I'm brought to the desktop for whatever reason) I have 10s of twiddling my thumbs. :) If it helps, the game shows FPS and it's a stable 62.