@craminu Unfortunately, no log can help on this matter. What I need are exact reproduction steps. If, for example, the bug occurs when you add rivers on a land tile next to a coast, then turn this coastal neighbor into a plain, tell me that. If the problem occurs on a specific map only, after doing change X on tile Y, then tell me that and provide me this map. Etcetera. You can just phrase the reproduction steps, or provide screenshots, or whatever method you think is best to explain it. The idea is that I must be able to reproduce the bug on my computer, then perform slight variations until I understand what exactly civ5 has trouble with (something like "there must be a coast tile between land and ocean tiles"). Once I figured out this "secret rule", I can make IGE prevent you to break this rule. If you already figured out the secret rule, of course, you can just tell me that. EDIT: I just realized that what you meant when you said that you were able to reproduce the problem, was that you can try to load the save again and get the game to freeze, not that you know how to trigger the source of the problem again. Unfortunately only Firaxis could use this savegame to figure out the problem, while neither this savegame nor any log could help me. Indeed, if the problem really came from IGE, it was because it broke a secret rule, and then only inferring this secret rule could help me prevent this to appear again.