Here you have example of this problem
DCS 1.5.7 stable with or without mods is the same.
TrackIR (in my case SmartNAV 4AT) sees tracking points without problems and breaks. The problem does not occur in other games (XPlane 10, IL2 COD).
My PC:
i7 3770k, Radeon Fury, Windows 8.1 Pro x64
Any idea what could be causing this issue?