@mostapha, I’m posting your suggestion from another post hoping it will help someone else facing the same issue. It was the number of CPUs. I initially put 4 CPUs, but as soon as I changed it to 1 everything worked perfectly. I’m using a Windows 10 computer, it’s a new one so I had to do a fresh installation of everything (Rhino, Grasshopper, HB, LB, Radiance…).
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