Importing meshes would change light settings

Does anyone know why the work environment gets dark (dark shadow sides) suddenly when importing meshes?

Ahh imported new lights from previous scene in exporting application (Modo) and Render View turned on. Would be better in Shaded View

Hi Hannes - Iā€™d try RebuildMeshNormals and see if that does anything useful.
Oh, never mind, it looks like you sorted it out.

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Thanks for your help @pascal it really was only the lights. Thanks again for your immediate help!