Oi. I have uninstalled, reinstalled both the GNS 530 mod, or Piper and still have the odd issue of hitting the Altitude Hold hidden “button” and the plane just jumps up frantically, increasing the angle of attack to over 3000fpm. To be fair, I hardly use that “hidden” option but I never had this issue before. Again, I have tried with or without the GNS 530 mod. There are no textures or anything added.