Looks like something (the latest patch?) broke generating AI grids. It should be saving to mods/(your mod name)/levels/(your level name)/Ai instead it's saving to mods/(your mod name)/Ai. So when you load a level, you'll always get the old generated ai grid, frozen in time forever, unable to change.
Or at least, that's what started happening to me. As a workaround, after you make changes and save, you need close the editor and copy the aigrid.data from where the editor is saving it to its correct location.
Hopefully they will fix this soon since if you don't have an aigrid.data, your mod will immiediedly crash when you load it. To get around this, you have to generate ai the first time you make a level, then go and copy it over, manually creating the ai folder for your new level.
