On Kobo, purchased books do not show up in the library. We’ve been assured that this was a matter of time.
On Nook, there is a weird formatting problem on the iPhone app; looks like some kind of a hard return problem. We do not yet have a solution for this. It works fine if viewed on a Web browser.
We will keep you posted. Let us know if you have any difficulties.
[Updated 6/11/15: Kobo is working fine now.]