Stacks in LR5 will not expand, and I can't seem to select any photo other than the top of the stack.

Since upgrading to LR5, I've been really frustrated by stacks. When I export to jpg, I add it to the library, and add it to a stack with the raw. In LR4, it was easy to select either of these files, since they were side-by-side in the library, but with a visible indication that they were linked. Now, choosing expand stack does exactly... nothing. As far as I can tell, I can either select the very top photo of the stack by clicking on it, or all files in the stack by clicking on the little 1 of X box on the stack, but I have no way of selecting individual files in a stack.