The latest patch seems to have broken something in the subwindows for setting Conditions and Abilities in the Behaviour Editor, as I shall describe:

 

You cannot select any ability or condition (clicking them does nothing most of the time, neither are they ever highlighted), scroll down with either the mousewheel or the bar itself or even close the window itself without pressing "esc" - in fact, clicking anything on the screen, in or outside the window, is ill advised as it might randomly spawn dozens of duplicates (which go away when pressing "esc", fortunately), but not crash the game itself.

This is really a shame because 90% of the fun I have in this game comes from setting up AI scripts in the first place (hardcore theorycrafter).

It may be similiar to my issue I had - I couldnt use abilities (they were greyed out and placed in one row outside character icons). I removed mods/unity console and verified steam install, but problem persisted, reinstall did the job though. Maybe it could help you?

Yes this happens to me a lot too. At first I thought it was one of my mods but after removing them all it still happens. Ususally what I do is I just quit to main menu then load the save again. This usually works until I encounter the issue again.

I did a reinstall the ai menu still doesnt work very annoying

to clarify you can change abilitys (at least on some of my charecter made pre 1.2) but the only condition I can choose is always true. makes creating custom ai's impossible

You could try a workaround that I post on this thread: https://forums.obsidian.net/topic/103308-12-behavior-editor-is-broken

 

 

 

For those who has this bug, you could try to access the Custom AI Screen directly, by right-clicking the icon on the bottom left of the screen (three icons where you could choose between AI: Off, Auto Attack Only, and Custom AI), not from Character Sheet or Inventory Screen.

I just tried that and it works. I just remembered that the character sheet is sometimes broken by not showing attribute breakdown.

If you guys could also do this than the real culprit is the menu screen which can't deliver AI screen correctly.