Envy
 
Someone covets something that another person has. The envy could be expressed as an outright attempt to get the object of desire or something more subtle.
Erratic Behavior
 
Someone or something exhibits wild, unexpected behavior. Could be party members, enemies, mounts, spells, or equipment.
Error of Judgment
 
Someone's better judgment fails. The trouble that ensues depends on the specific error that is made.
Extreme Caution
 
Someone exercises extreme caution. Is the caution necessary, or is it exaggerated? What is the disadvantage from using so much caution?
Greed
 
Desire for wealth diverts a character from normal activity. The object of this desire can be specific (e.g. a certain necklace) or general (e.g. gold!).
Horrible Failure
 
What was a simple failure becomes a disaster. Attempts to persuade people backfire, arrows strike the wrong targets, and the wrong demons get conjured.
Inopportune Arrival
 
Someone or something shows up to the chagrin or disadvantage of someone. Unwelcome relatives and hated enemies are possibilities.
Internal Conflict
 
Conflicts arise within a person or within a group. How did these conflicts come about? How can they be resolved? Are they hidden? Poorly hidden?