Large downloads now not working...
As an update, I wiped the tablet with a fresh install of 10.1.3 (stable) and the app seemed to be running much better. Still going with the non-HD downloads as I really don't see a need for it.
Still having a problem with the Nook choking on larger downloads - trade collections are getting stuck at 8% while single issues seem to need a minute or so to start the download (but the single issues come through just fine). I've tried clearing the cache, force-closing the app, rebooting the tablet, etc., but no luck with the larger books. Comixology support suggested that I hit Restore Purchases under Settings, but that didn't seem to make any difference. Feeling frustrated as I really want to read these particular books.
Another note is that I can't read any titles when the app is stuck trying to download something - the books are listed, but I get a blank screen whenever trying to open one. What else can I try to get the large downloads working?