I have exactly the same problem.I had a rotational fall in october and injured myself and lost my pony due to the injury he got.
New pony was brilliant in her old home, new yard and shes quirky and nappy and wont hack. Runs backwards, naps and whips round, if i push her she rears ( having questioned them they have now admitted she does do littke rears when trying it on! - had asked if she reared, bucked etc before viewing! ) shes even slipped whipping round and fallen on me on the road. Its not a pain issue as she will do it in hand or long reining if she doesnt want to go. On the ground shes a saint. Im now too terrified to get on her and dont know what to do with her.
