How to fix black screen on Filteronme camera?

The #1 cause is app order: open Filteronme before you open the app you're using it in (Zoom, Discord, OBS, etc.). Windows needs Filteronme open for the camera to work at all; on Mac 2.1+ you can close Filteronme again once you've selected the camera.

Confirm Filteronme has control of your camera — you should see yourself in its preview — before switching to the other app.

Still black? Work through the rest of the fix ladder:

1. Reboot the Filteronme app.
2. Mac only: toggle camera permission for Filteronme off and back on in System Settings.
3. Mac only: toggle the camera extension off and back on.

4. Reinstall the camera extension (top-left menu → Advanced → Uninstall Extension, then reopen Filteronme).
5. Restart your computer.

Full steps, plus a full-reinstall option if none of this works: how to fix most problems.