The most likely fix is to make Roblox and OBS use the same capture path and same GPU, then test a different capture method. A black game capture and a white window capture usually points to a Roblox/OBS compatibility issue rather than a broken scene.

Try this order

  1. Run OBS as administrator. This is a common fix for Roblox capture issues.
  1. In OBS, remove the current Roblox source and add a fresh one.
  2. For Game Capture, choose Capture specific window and select the Roblox client explicitly.
  1. If Game Capture stays black, use Window Capture and set the capture method to Windows 10 (1903 and up) or Windows Graphics Capture.
  1. Put Roblox in borderless windowed or windowed mode and disable fullscreen optimizations for Roblox.exe.
  1. Update your graphics drivers and restart both Roblox and OBS.

Why it happens

Game Capture can fail if OBS and Roblox are running on different GPUs, if permissions don’t match, or if Roblox is using a mode OBS doesn’t hook cleanly. A white Window Capture often happens when the wrong capture method is selected, especially if the source is set to a method that doesn’t play nicely with the current Roblox window.

Fastest workaround

If you need it working right now, use Window Capture with the correct Roblox window selected and the Windows 10/graphics capture method. If that still fails, fall back to Display Capture and crop it to the Roblox window.

Extra checks

  • Turn off overlays like Discord, Steam, GeForce Experience, and the Windows Game Bar.
  • Make sure OBS and Roblox are both updated.
  • If your PC has integrated and dedicated graphics, force both apps onto the same GPU.

TL;DR: restart OBS as admin, recreate the source, set Game Capture to the specific Roblox window, and if it stays black, switch Window Capture to Windows 10/Graphics Capture.