Roblox has pushed several updates that, among other things, breaks all functionality with third party tools, including but not limited to NVIDIA ShadowPlay, Ansel, screenshots, and OBS window hooking.
If you need to screenshot or record Roblox, use Windows' own screenshot functions (Print Screen or Snipping Tool) and the desktop recording functionality of ShadowPlay/OBS.
THERE IS NO WORKAROUND OTHERWISE.
ANY THREAD THAT IS ABOUT ROBLOX AND NVIDIA OVERLAY FUNCTIONALITY WILL BE LOCKED.
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