Hello,
I just dragged asset into the world and deleted it then my 4.18 crashed please help me.
This crash is due to the your GPU becoming unavailable to UE4 very likely due to Windows TDR resetting it. Few things to try:
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Update your graphic card drivers (you may want to do a clean uninstall with DDU first)
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Turn off CPU/GPU overclocking
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Turn off Real Time thumbnails. In the Content Browser, select “View Options” at the bottom right and turn off “Real-Time Thumbnails”
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Check that you don’t have conflicts with other application tweaking/boosting DirectX. NVidia’s live game recording should also be turned off (NVidia Share aka Shadowplay)