What can I do if KF2 hangs on a black screen with music?

The guide's author runs zapret with the best configuration for his network and connects Cloudflare WARP in Traffic and DNS (UDP) mode, after which the game loads.

Do these programs have to stay on every time I launch?

Yes, according to the author, zapret and WARP must be active to launch KF2 again.

Where else can I look for black screen causes?

See the KF2 black screen and audio page and the startup crash troubleshooting guide.

Fixes & Performance

KF2 Black Screen With Music on Launch: zapret and WARP Fix (2026)

This short 2026 guide, written in Russian, describes a way to fix the black screen with music when Killing Floor 2 loads. The author solves it at the network level: he runs zapret and the Cloudflare WARP client, after which the game loads without hanging. If your cause is different, see the general pages KF2 black screen and audio and startup crash troubleshooting.

Steps

Download zapret from the latest release page of the Flowseal project (github.com/Flowseal/zapret-discord-youtube/releases/latest) and extract it anywhere.
Open the extracted zapret folder and run service.bat.
In service.bat choose "Run Tests", in the PowerShell window choose "Standard Tests" and use "All Configs" to find the best configuration for your network.
After finding the best config, in the service.bat window set "game filter" to "Enabled (TCP and UDP)" and "IPSet Filter" should be "loaded".
Start the best configuration, either from service.bat ("Install Service") or from the bat files in the zapret folder.
Download the WARP client from Cloudflare (developers.cloudflare.com/warp-client/get-started/windows/) and install it from the .msi.
After installing, set the mode to "Traffic and DNS (UDP)" and connect.
Start KF2; the game should now load normally.

Important condition

Every time you launch KF2 again, zapret and WARP must be active.

About this guide

The author does not explain the mechanism in detail and only describes the sequence that worked for him in 2026. Results may depend on your provider and network setup; if it does not help, try the standard measures from the startup guide: verifying file integrity, deleting the config folder and disabling conflicting programs.

FAQ

What can I do if KF2 hangs on a black screen with music?: The guide's author runs zapret with the best configuration for his network and connects Cloudflare WARP in Traffic and DNS (UDP) mode, after which the game loads.
Do these programs have to stay on every time I launch?: Yes, according to the author, zapret and WARP must be active to launch KF2 again.
Where else can I look for black screen causes?: See the KF2 black screen and audio page and the startup crash troubleshooting guide.