So I have a pretty decent computer, (i5-4460 3.20GHz, 8 GB Ram, GTX 750 Ti) and I've been using OBS for a while now with no problems at all, it's been very smooth. All of a sudden I turn OBS on to record a video, (but first i always check the preview) and it showed the screen capture and overlay. However, my webcam didn't show up and then the OBS preview screen froze. I've tried restarting the program and my computer, even uninstalling OBS and reinstalling it. Nothing works hopefully someone can help me, I've tried encoding settings down scaling my resolution (which I don't want to do) and still no change.