ANOTHER BUG WITH ITF:
If your part of a bigger family and you take one sim to the future and die, it can cause all sorts of worse bugs. First off, the gravestone disappears. Next, if your sim owned a house in the future, the present family does not obtain it at all, so it is lost (this maybe done intentionally?). When you try to send other family members of the same sim who died in the future, they get screwed up moodlets. For example, my plumbot got a "hungry" moodlet, even though plumbot's do not eat.
BEST FIX FOR THIS: RESET TO LAST SAVE, and if your one sim is close to death, send him to present to die..as dying in the future is incredibly buggy..