Several locations in the campaign which had monsters on them, which I destroyed, then had the goodie icon over their location. Moving my hero to the location would not give out the goodie, nor would the icon go away, and in one case the monsters actually respawned. The following links are debug.err and a screenshot:
https://dl.dropbox.com/u/836469/debug.err
https://dl.dropbox.com/u/836469/fallen_enchantress_1.png