I bought my mare in August 2015 as a safe happy hacker for a novice. I rode her twice before buying her and she was great. Sadly the move really threw her and she became a totally different horse, I'm sure you all know the story. I've almost sold her on a couple of occasions but have carried on with help from my instructor.
I can ride her now but she is still very spooky and still terrified of tractors (she was bombproof in traffic before the move) so much so that I have to get off and walk her past them. As I live in a rural area I spend a lot of time walking rather than riding! As I have had her over a year, I'm wondering if I should throw in the towel and look for something more suitable for me. However, as she is a lovely mare otherwise, perhaps I should hold on and maybe she will come right in the end.
I would love to hear from you if your horse took more than a year to revert to type, just for a bit of hope.