Haven't got program yet, so guessing...
Based on other comments, I'd suggest you start by turning OFF TFP's hardware acceleration during rendering.
IIRC, Jack Zimmer's 'Rule of Thumb' is "ON while editing, OFF for Renders", at least until the will/won't OpenGL issues are resolved.
FWIW, I've had to turn FP's 'HA' OFF *and* PC's 'HA' down a notch or two since ~ v6. I've built / up-graded my CAD PCs specifically to support FP's OpenGL rather than gaming's Direct-X, but none of it seemed to help...