It's only a fairly new save, maybe a couple of weeks real time, and I haven't played it much recently. So it's first generation, but it's a full house almost with two sims, two horses, a cat and dog. I haven't tried with another save yet, will do that today.
I did do a "save as" first because I didn't want to lose that family, but that didn't work, then I tried with the original save file, that didn't work. I guess if it's a bugged family then using a save as file would just save any glitches. I haven't had any problems whatsoever with any glitches in that save, though, bar the travel/camera one.
My computer is fine, has enough memory and space etc for it.
I read something about clearing out family inventory before travelling, too, because that can affect it, so I will also try that.
Thanks Trip
EDIT - Just created a new game, that Sim has travelled fine. So does that mean my other game with the problems won't be able to travel at all?