I'd rather have a log from the session where you're having trouble.
20:33:20.115: CPU Name: AMD Ryzen 5 1500X Quad-Core Processor
20:33:20.115: CPU Speed: 3493MHz
20:33:20.115: Physical Cores: 4, Logical Cores: 8
20:33:20.115: Physical Memory: 8122MB Total, 4748MB Free
20:33:20.115: Windows Version: 10.0 Build 16299 (revision: 192; 64-bit)
20:33:20.115: Running as administrator: false
20:33:20.115: Aero is Enabled (Aero is always on for windows 8 and above)
20:33:20.115: Windows 10 Gaming Features:
20:33:20.115: Game DVR: On
20:33:20.116: Sec. Software Status:
20:33:20.117: Windows Defender Antivirus: enabled (AV)
20:33:20.118: Windows Firewall: enabled (FW)
20:33:20.118: Windows Defender Antivirus: enabled (ASW)
20:33:20.119: Portable mode: false
20:33:20.135: OBS 21.0.1 (64bit, windows)
20:33:20.135: ---------------------------------
20:33:20.136: ---------------------------------
20:33:20.136: audio settings reset:
20:33:20.136: samples per sec: 44100
20:33:20.136: speakers: 2
20:33:20.137: ---------------------------------
20:33:20.137: Initializing D3D11...
20:33:20.137: Available Video Adapters:
20:33:20.139: Adapter 1: NVIDIA GeForce GT 1030
20:33:20.139: Dedicated VRAM: 2089353216
20:33:20.139: Shared VRAM: 4258652160
20:33:20.139: output 1: pos={0, 0}, size={1920, 1080}, attached=true
20:33:20.141: Loading up D3D11 on adapter NVIDIA GeForce GT 1030 (0)
20:33:20.183: D3D11 loaded successfully, feature level used: 45056
20:33:20.923: ---------------------------------
20:33:20.923: video settings reset:
20:33:20.923: base resolution: 1920x1080
20:33:20.923: output resolution: 1920x1080
20:33:20.923: downscale filter: Lanczos
20:33:20.923: fps: 60/1
20:33:20.923: format: NV12
20:33:20.930: Audio monitoring device:
20:33:20.930: name: Default
20:33:20.930: id: default
20:33:20.930: ---------------------------------
20:33:20.933: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/chrome_elf.dll' not found, loading of module failed
20:33:20.935: [CoreAudio encoder]: CoreAudio AAC encoder not installed on the system or couldn't be loaded
20:33:20.993: [AMF] <obs_module_load> AMF not supported (no AMD graphics)
20:33:20.993: Failed to initialize module 'enc-amf.dll'
20:33:21.027: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/libcef.dll' not found, loading of module failed
20:33:21.028: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/libEGL.dll' not found, loading of module failed
20:33:21.028: Required module function 'obs_module_load' in module '../../obs-plugins/64bit/libGLESv2.dll' not found, loading of module failed
20:33:21.029: Failed to load 'en-US' text for module: 'obs-browser.dll'
20:33:21.029: [browser_source: 'Version: 1.29.0']
20:33:21.033: NVENC supported
20:33:21.081: Couldn't find VLC installation, VLC video source disabled
20:33:21.085: No blackmagic support
20:33:21.130: ---------------------------------
20:33:21.130: Loaded Modules:
20:33:21.130: win-wasapi.dll
20:33:21.130: win-mf.dll
20:33:21.130: win-dshow.dll
20:33:21.130: win-decklink.dll
20:33:21.130: win-capture.dll
20:33:21.130: vlc-video.dll
20:33:21.130: text-freetype2.dll
20:33:21.130: rtmp-services.dll
20:33:21.130: obs-x264.dll
20:33:21.130: obs-vst.dll
20:33:21.130: obs-transitions.dll
20:33:21.130: obs-text.dll
20:33:21.130: obs-qsv11.dll
20:33:21.130: obs-outputs.dll
20:33:21.130: obs-filters.dll
20:33:21.130: obs-ffmpeg.dll
20:33:21.130: obs-browser.dll
20:33:21.130: image-source.dll
20:33:21.130: frontend-tools.dll
20:33:21.130: enc-amf.dll
20:33:21.130: coreaudio-encoder.dll
20:33:21.130: ---------------------------------
20:33:21.131: ==== Startup complete ===============================================
20:33:21.133: All scene data cleared
20:33:21.133: ------------------------------------------------
20:33:21.201: WASAPI: Device 'Speakers (2- Logitech G430 Gaming Headset)' initialized
20:33:21.207: WASAPI: Device 'Microphone (2- Logitech G430 Gaming Headset)' initialized
20:33:21.211: Switched to scene 'New?'
20:33:21.212: ------------------------------------------------
20:33:21.212: Loaded scenes:
20:33:21.212: - scene 'Scene':
20:33:21.212: - source: 'Fortnite' (monitor_capture)
20:33:21.212: - scene 'New?':
20:33:21.212: - source: 'Screen' (monitor_capture)
20:33:21.212: ------------------------------------------------
20:33:21.244: adding 46 milliseconds of audio buffering, total audio buffering is now 46 milliseconds
20:33:44.703: ==== Shutting down ==================================================
20:33:44.710: Switched to scene '(null)'
20:33:44.711: WASAPI: Device 'Speakers (2- Logitech G430 Gaming Headset)' Terminated
20:33:44.719: WASAPI: Device 'Microphone (2- Logitech G430 Gaming Headset)' Terminated
20:33:44.721: All scene data cleared
20:33:44.721: ------------------------------------------------
20:33:44.768: Freeing OBS context data
20:33:44.796: [Scripting] Total detached callbacks: 0
20:33:44.823: == Profiler Results =============================
20:33:44.823: run_program_init: 1211.82 ms
20:33:44.823: ┣OBSApp::AppInit: 17.777 ms
20:33:44.823: ┃ ┗OBSApp::InitLocale: 2.516 ms
20:33:44.823: ┗OBSApp::OBSInit: 1181.89 ms
20:33:44.823: ┣obs_startup: 4.987 ms
20:33:44.823: ┗OBSBasic::OBSInit: 1123.67 ms
20:33:44.823: ┣OBSBasic::InitBasicConfig: 0.419 ms
20:33:44.823: ┣OBSBasic::ResetAudio: 0.166 ms
20:33:44.823: ┣OBSBasic::ResetVideo: 794.026 ms
20:33:44.823: ┣OBSBasic::InitOBSCallbacks: 0.009 ms
20:33:44.823: ┣OBSBasic::InitHotkeys: 0.134 ms
20:33:44.823: ┣obs_load_all_modules: 199.905 ms
20:33:44.823: ┃ ┣obs_init_module(coreaudio-encoder.dll): 1.088 ms
20:33:44.823: ┃ ┣obs_init_module(enc-amf.dll): 56.706 ms
20:33:44.823: ┃ ┣obs_init_module(frontend-tools.dll): 22.25 ms
20:33:44.823: ┃ ┣obs_init_module(image-source.dll): 0.004 ms
20:33:44.823: ┃ ┣obs_init_module(obs-browser.dll): 0.065 ms
20:33:44.823: ┃ ┣obs_init_module(obs-ffmpeg.dll): 1.2 ms
20:33:44.823: ┃ ┃ ┗nvenc_check: 1.126 ms
20:33:44.823: ┃ ┣obs_init_module(obs-filters.dll): 0.024 ms
20:33:44.823: ┃ ┣obs_init_module(obs-outputs.dll): 0.013 ms
20:33:44.823: ┃ ┣obs_init_module(obs-qsv11.dll): 39.205 ms
20:33:44.823: ┃ ┣obs_init_module(obs-text.dll): 0.492 ms
20:33:44.823: ┃ ┣obs_init_module(obs-transitions.dll): 0.008 ms
20:33:44.823: ┃ ┣obs_init_module(obs-vst.dll): 0.001 ms
20:33:44.823: ┃ ┣obs_init_module(obs-x264.dll): 0.001 ms
20:33:44.823: ┃ ┣obs_init_module(rtmp-services.dll): 1.006 ms
20:33:44.823: ┃ ┣obs_init_module(text-freetype2.dll): 0.047 ms
20:33:44.823: ┃ ┣obs_init_module(vlc-video.dll): 0.062 ms
20:33:44.823: ┃ ┣obs_init_module(win-capture.dll): 0.093 ms
20:33:44.823: ┃ ┣obs_init_module(win-decklink.dll): 2.572 ms
20:33:44.823: ┃ ┣obs_init_module(win-dshow.dll): 1.026 ms
20:33:44.823: ┃ ┣obs_init_module(win-mf.dll): 40.842 ms
20:33:44.823: ┃ ┣obs_init_module(win-wasapi.dll): 0.006 ms
20:33:44.823: ┃ ┗reset_win32_symbol_paths: 0.118 ms
20:33:44.823: ┣OBSBasic::ResetOutputs: 0.333 ms
20:33:44.823: ┣OBSBasic::CreateHotkeys: 0.257 ms
20:33:44.823: ┣OBSBasic::InitService: 1.166 ms
20:33:44.823: ┣OBSBasic::InitPrimitives: 0.214 ms
20:33:44.823: ┗OBSBasic::Load: 79.343 ms
20:33:44.823: obs_hotkey_thread(25 ms): min=0.003 ms, median=0.009 ms, max=0.455 ms, 99th percentile=0.151 ms, 100% below 25 ms
20:33:44.823: audio_thread(Audio): min=0 ms, median=0.071 ms, max=0.42 ms, 99th percentile=0.146 ms
20:33:44.823: obs_graphics_thread(16.6667 ms): min=0.31 ms, median=1.13 ms, max=5.252 ms, 99th percentile=2.03 ms, 100% below 16.667 ms
20:33:44.823: ┣tick_sources: min=0.001 ms, median=0.196 ms, max=3.577 ms, 99th percentile=0.754 ms
20:33:44.823: ┣output_frame: min=0.301 ms, median=0.776 ms, max=3.611 ms, 99th percentile=1.252 ms
20:33:44.823: ┃ ┣gs_context(video->graphics): min=0.121 ms, median=0.179 ms, max=1.882 ms, 99th percentile=0.341 ms
20:33:44.823: ┃ ┃ ┣render_video: min=0.045 ms, median=0.073 ms, max=0.384 ms, 99th percentile=0.147 ms
20:33:44.823: ┃ ┃ ┃ ┣render_main_texture: min=0.005 ms, median=0.038 ms, max=0.159 ms, 99th percentile=0.078 ms
20:33:44.823: ┃ ┃ ┃ ┣render_output_texture: min=0.006 ms, median=0.009 ms, max=0.183 ms, 99th percentile=0.043 ms
20:33:44.823: ┃ ┃ ┃ ┣render_convert_texture: min=0.002 ms, median=0.011 ms, max=0.141 ms, 99th percentile=0.033 ms
20:33:44.823: ┃ ┃ ┃ ┗stage_output_texture: min=0 ms, median=0.002 ms, max=0.034 ms, 99th percentile=0.013 ms
20:33:44.823: ┃ ┃ ┣download_frame: min=0 ms, median=0.002 ms, max=0.159 ms, 99th percentile=0.051 ms
20:33:44.823: ┃ ┃ ┗gs_flush: min=0.052 ms, median=0.1 ms, max=1.814 ms, 99th percentile=0.2 ms
20:33:44.823: ┃ ┗output_video_data: min=0.494 ms, median=0.589 ms, max=3.25 ms, 99th percentile=0.952 ms
20:33:44.823: ┗render_displays: min=0 ms, median=0.143 ms, max=2.087 ms, 99th percentile=0.351 ms
20:33:44.823: video_thread(video): min=0.001 ms, median=0.002 ms, max=0.008 ms, 99th percentile=0.005 ms
20:33:44.823: =================================================
20:33:44.823: == Profiler Time Between Calls ==================
20:33:44.823: obs_hotkey_thread(25 ms): min=24.766 ms, median=25.197 ms, max=28.88 ms, 94.8665% within ±2% of 25 ms (0% lower, 5.13347% higher)
20:33:44.823: obs_graphics_thread(16.6667 ms): min=16.527 ms, median=16.667 ms, max=16.802 ms, 100% within ±2% of 16.667 ms (0% lower, 0% higher)
20:33:44.823: =================================================
20:33:44.837: Number of memory leaks: 1