So for me the latest FSDT update that works with P3D's hotfix, causes CTD, StackHash_0a9e module error, almost every time I open the sim.
I can't see how this can have anything to do with the updated Addon Manager. Usually, when we need to support a new build of the sim, we need to change a few internal pointers to access directly in memory, that always (almost) change between builds.
But in THIS specific case, we found (after testing each one, of course) the hotfix hasn't changed anything in those memory offsets so, the ONLY update we had to do to the Addon Manager, was just to allow it to recognize the new build, and that's it.
Nothing else has changed so, if the pre-Hotfix 2.5 version worked for you (the change from 2.4 to 2.5 WAS, instead, VERY significant), there's no reason why you would have problems with the Hotfixed version, since the code it 100% the same, except for the line that accepts both build numbers as valid, in order to continue executing the Addon Manager.
Of course, before replying to you, I've loaded the P3D at FSDT KDFW, used GSX to pushback the default Lockheed Constellation, and no problems came out.
If you can contact me with a PM, we might arrange a Teamviewer session, so we might find out what the problem really was.