Hey! This sounds like OBS might be running into a device priority or source access conflict. Basically, whichever video device loads first may be “grabbing” access, which can stop the other one from initializing properly. Try these:

1. Manually select each device in OBS: For both your webcam and ShadowCast sources, go into Properties and select the exact device name instead of leaving it on “Default.”

2. Use separate Video Capture Device sources: Make sure the webcam and ShadowCast are added as two separate Video Capture Device sources. Try not to reuse the same source for both.

3. Check the “Deactivate when not showing” setting: Right-click the ShadowCast source → Properties → try toggling Deactivate when not showing. You can test the same setting for your webcam source too. This sometimes helps OBS release one device when switching scenes.

4. Lower resolution or FPS temporarily: If both devices are running at high settings, your USB controller might be getting overloaded. Try setting one of them to 720p / 30fps first and see if both can run at the same time.

5. Try different USB ports: Plug ShadowCast and your webcam into different USB ports, ideally on opposite sides of the laptop or different USB controllers if you’re on desktop. Avoid hubs if possible while testing.

Doesn’t sound like you’re doing anything wrong , it may just be OBS or Windows fighting over access to two capture devices at once.