  We present a detailed dynamical analysis of the orbital stability of the two
circumbinary planets recently proposed to orbit the evolved eclipsing binary
star system NSVS 14256825. As is the case for other recently proposed
circumbinary planetary systems detected through the timing of mutual eclipses
between the central binary stars, the proposed planets do not stand up to
dynamical scrutiny. The proposed orbits for the two planets are extremely
unstable on timescales of less than a thousand years, regardless of the mutual
inclination between the planetary orbits.
  For the scenario where the planetary orbits are coplanar, a small region of
moderate stability was observed, featuring orbits that were somewhat protected
from destabilisation by the influence of mutual 2:1 mean-motion resonance
between the orbits of the planets. Even in this stable region, however, the
systems tested typically only survived on timescales of order 1 million years,
far shorter than the age of the system.
  Our results suggest that, if there are planets in the NSVS 14256825 system,
they must move on orbits dramatically different to those proposed in the
discovery work. More observations are clearly critically required in order to
constrain the nature of the suggested orbital bodies.
