I'm pretty angry, partially because I've started and stopped this legacy without blogging about it so many times before and not all those other attempts glitched but also at EA because this isn't the first glitch I've come across. Anyway, I've had to uninstall and reinstall The Sims 3 completely.
I'm going to start a new legacy and hope it doesn't glitch again and will link to it here, just in case. Wish me luck.
The (hopefully un-glitched) Smith Legacy http://thesims3thesmithlegacy.blogspot.com/