[11th_AF_Sapper]

There are a couple things you can try, these generally fix my issues. 1st try running the latest AC installer after each plane installation. If that doesn't fix your problems, figure out which INI is broken whether it be air.ini, planes.ru, or weapon.ru (most likely the air.ini). once that has been figured out you can do one of 2 things, replace the ini with the original located in the UI 1.1 rar files, or find the bad entry and delete it. The 1st option in my opinion is the better, I would also recommend using a program called 7zip to pull out the exact file needed. Hope that helps you, some planes I've noticed conflict with other planes on certain computers. For instance I can't have the SwordFish and the Hellfax installed at the same time other wise the same issue occurs. Sorry if i didn't get the INI's right as well, its been a while since i tinkered with anything.