(Steampowered, WinXP SP3, 3.25GB RAM, Dual Core 2.2 GHz)

Perhaps it's not a bug and I'm missing something? I've defeated all the monsters and killed the boss beast, visited all the lairs and graveyards, yet the territory is still locked out against settling. The quest says I need to clear all the scarred tiles. I'm not sure I have. Do the scarred tiles look any different from the rest of the forest?

Is it because I used 2 or 3 separate armies? Is it because I brought my own dragon, golems and Fallen to do some of the fighting so it thinks I didn't clear the land? Did the achievement notification interrupt the code to unlock the land?

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Just remembered: There was a brief period of slow performance (GEForce video card reported 1.6 fps) immediately after the battle with the boss while the animation of the boss's death played on the main map. I saved and exited the game through the menu to recover performance. There was no crash.