Board Thread:Questions and Answers/@comment-25938755-20141229164938/@comment-24577221-20141230204937

A couple of other things to try, if you're up for it. Try clicking on the location where the breeder ought to be, if you haven't already. Try moving some other object into that location, to see if the game thinks that space is still occupied.

Some years back, we had a weird bug at work... all of the menus for our software showed that an item was showing on the screen, but as far as we could see, the item was totally not there. Eventually I played a hunch, loaded up the debugger to look at the details of the item's state, and found that it really was on but that it had been rendered 100% transparent -- or, as my first boss had described something similar, "only the pure of heart could see it".

If the breeder is there but invisible, you might not be able to select it. But the game probably wouldn't let you move anything into the same space, regardless.