Thalek, what I would advise is start a new scene. Delete all the lights. Add back one or too, maybe an infinite and a spot. Set them to raytracing. Get your blur setting etc the way you want. Then to go General Preferences and save that as your preferred state. Then, whenever you start a new scene, you're not carrying a bunch of useless baggage.

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Hardware: AMD Ryzen 9 3900X/MSI MAG570 Tomahawk X570/Zotac Geforce GTX 1650 Super 4GB/32GB OLOy RAM

Software: Windows 10 Professional/Poser Pro 11/Photoshop/Postworkshop 3