Check this stutters tonight. Looks they appear only with IXEG FMC and ND model - in cold'n'dark it not appear for me, then systems are on, but IRS not aligned and no flightpath on ND - it not appear. It appears with flightpath on ND (map mode), rises then arcft begin moving, rises more then set map on both ND's, rises more then both ND's set to diff map mode range, decreases then set ND's to ILS mode, and next decreases then you are in air with ND in ILS mode. After FMS reset after land it not notice.
That was my check.
I mean this stutters seen on dataref graph, but in X-plane it not strong for me for dissapoint. Without this topic i wouldn't know it most likely. )))