Which hair is it BTW? Is it the default texture? Creators alternate texture or aftermarket? A simple texture node or complicated?

Have you tried making all the elements a simple colour only, rendering, then reapplying the required texture. Make sure all elements have Display/Element Style set to Use Figure Style and Display/Figure Style is set to USe Doc Style

Poser 11 , 180Gb in 8 Runtimes, PaintShop Pro 9
Windows 7 64 bit, Avast AV, Comodo Firewall
Intel Q9550 Quad Core cpu,  16Gb RAM, 250Gb + 250Gb +160Gb HD, GeForce GTX 1060