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Me too, WIn7 / Platform Win / Forward / DX11 an & off /  ... but today everything works fine..
I will stay tuned :)

ok, the only "bugg" is when i create a Time Node, and do nothing for 10-15minutes in Shader Editor (or play with another Nodes) , all "Time Nodes" will no longer work, i need to reload this Shader or sometimes restart Unity