Hey I know I'm not the programmer in here. I just know some of the basics. But follow these steps and you'll see a bug in Links 2.0 ...

1.Make 2 test categories
2.Make one related to the other.
3.Delete one category'
4.view left over category and you'll see the deleted category is still in the related category field.

Would that be very hard to address? Because if you have that category related in several others you end up having dead links all over the place.