Since September 29, 2014, the fix v2.4 was delivered to the public. This new version of Prepar3D is a much stable version than before and brings a lot of new features.
Certainly, it is not perfect but with some changes we approach some idea of the simulation FSX only in DirectX 10 was beginning to grasp.
My old configuration v2.3 had be upgraded according Rob Ainscough advices (http://www.robainscough.com) and the patch v2.4 provided by L.M.
For me, it is THE best version for network game with multi-players
Installation of Prepar3D v2.4 patch: http://forum.avsim.net/topic/452190-prepar3d-v24-patch-will-be-released-monday-92914/
PreparSolution to P3D v2.4 and v2.3 vertical cloud issue: http://forum.avsim.net/topic/457324-solution-to-p3d-v24-and-v23-vertical-cloud-issue/