Thanks for the reply, Pete.
Yes, I saw that other thread, but since my bugs were different from what you were describing, I wasn't sure if tacking something different onto the end might be deemed hijacking the thread, so I opted for opening a new one.
Thanks for confirming I'm not alone in this (

) — my mistake, though, I thought that the bugs I was describing had actually been fixed a while back. I guess not.
OK, stating the obvious, but I'd rather things like this get fixed than have a new round of reader rewards and the like.
(Sorry to grump, don't mind me, but I personally have no interest in the "social media" aspects and suchlike sparkly bits. I bought the thing to read books, and I kinda figure bugs in the display and navigation of a book should probably be top priority in new firmware releases. And now I think at this point I'm supposed to say "Bah, humbug!")