Is there, for PMs, a "mark as read" button? I usually just look at the most recent message and then look in the "topic review" place down at the bottom to read the previous replies. That leaves approximately one bajillion "unread messages" in my inbox. Is there a solution that doesn't involve deleting the PM's (since I prefer to save them?)

Yes, there is. Next to every PM is a little check box. Check all the messages, scroll down, and find the drop down menu (the default for it is mark/unmark important, if you need specific text to look for.) There's an option to mark read on that.

I've checked... there is not a "mark as read" button. You can mark important, delete, or move to another folder. None of those will convince my UCP that I don't have unread messages.

Okay... there used to be a mark as read button. I used it just earlier this week.

*is completely befuzzled*

There are Mark as Read buttons on the forums, but not on the PMs, evidently. Hopefully that is easy to implement..

For now, try clicking on the bottom one, and then clicking on the Next PM link to go up through them all. That will mark them as read as you go through, without having to click on each PM individually.

There's a next PM link?! That's extremely helpful! Next time I get to my inbox I shall look for it.