I've posted about this issue before but the problem seems to be incrementally getting worse. I've included a geometry that I have similar issues with when a number of objects are placed with it in an assembly. It appears to only affect the spline extrusions. At first it would be possible to get around the problem via use of realistic shading and ray tracing--unfortunately that is no longer the case. I've checked both memprob and run diagnostics for the issue and adjusted the various setting within Inventor Professional 2015 with no success. The current assembly is, what I would consider, on the small side (173/70). I'm at my witt's end with this so any help would be greatly appreciated.
When zoomed out a certain distance from the object:
When slightly zoomed in to the object:
This is actually adjusting the geometry and is present when I export the object as can be witnessed here in this exported PDF screen capture:
