Got an interesting one.

Savegame packed as 7z, 200kB: http://www.file-upload.net/download-7988571/JA2Save.7z.html
Also been renamed, you will need to remove the additional information.

Revision 6239.

You will need to change the following values in Ja2_Options.ini from the trunk to start the savegame:

For the bug to occur, you will need to set the following parameter in CTHConstants.ini:
This can be any value, apparently, equal to 1.55 or higher. Lower values than 1.54 or equal will prevent the bug from happening. Tested values are 1.1, 1.52, 1.53, 1.54, 1.55, 1.6, 1.7, 1.8, 3.0.
Edit: The crucial threshold seems to be between 1.54000002 and 1.54000003.

What you need to do: Load up the savegame, go to the combat in Drassen Mine, end the turn.

What should happen: Enemies will move. Raven will spot one enemy. A female soldier will run around the corner behind the church and charge towards Haywire. The screen will go black and it will output an error message via dialog box, titled "Error", saying "Unhandled exception. Unable to recover."

What will prevent the bug: Either another RANGE_COEFFICIENT value at 1.54 or lower (or somewhere in between 1.54 and 1.55 but I didn't test it further). OR you can load the game, cheat with GABBI, hit Alt+E to see enemies, there will be five soldiers behind the church of whom two soldiers are next to each other closest to the right church corner. Target the outer one that is not directly at the church wall (the woman that will run around the corner) and hit her with Ctrl+H once. She won't have enough AP to get close and the bug won't occur.

Also, I'm very interested in your findings, so if this gets a proper solution, I'd be delighted about a quick PM linking me to the topic. Good hunt! ^^


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Super Edit: Same phenomenon, new angle. More data.

Savegame: http://www.file-upload.net/download-7988813/JA2Save2.7z.html

1) The range coefficient threshold for the crash depends on GRAVITY_COEFFICIENT as well. Default is 4.0.

With values of 3.238374 and below (tested to 1.0), the RANGE_COEFFICIENT threshold will be between 1.560000002 and 1.560000003.
With values of 3.238375 and higher (tested to 4.3, will change at 4.4 or earlier), the threshold will be between 1.41000002 and 1.41000003.

2) The enemy soldier has a P229R. The target this time seems to be Buzz on the roof of the dental clinic building, weirdly, as Buzz cannot be seen from the position the soldier is on when the game crashes. I have tried the same circumstances with Buzz being left one tile behind or prone so she wouldn't get spotted and the bug didn't happen.

What you need to do to trigger it: Have Razor run 3 tiles along the house wall, PAST the window, not only in front of it.

What should happen: The enemy soldier will get an interrupt when Razor has run past the window, will turn around and run towards the church window to take a peek. The game crashes. If not, Raven will spot her and say a prayer.

This is some AI related calculation but it doesn't seem to require line of sight to the target. But that's just my observation, I won't hypothesize about code.