Please try inserting the light dwg into the test.3dm model
LIGHT_PLAN.dwg (60.3 KB)
Test.3dm (69.0 KB)
By the way it seems to happen also in Rhino 6
Please try inserting the light dwg into the test.3dm model
LIGHT_PLAN.dwg (60.3 KB)
Test.3dm (69.0 KB)
By the way it seems to happen also in Rhino 6