+1.
I've noticed that sometimes the inbox is very slow to detect new files and sometimes it won't detect them at all. Several is the times that MB failed to detect several albums. I had to cut these folders, paste them elsewhere, cut 'em again and paste them into the watched Inbox-folder, then MB detected them.
It's worthy to note that my XP is not up to date regarding updates 'n fixes so it may or may not have to do with this, because before my reinstall of XP a couple of weeks ago MB detected files as it should. I just wish that, like you do, there were a reload inbox-feature. It would be nice if it could remove dead links also. F5 and the reload-button doesn't work for me either, I don't think it's supposed to be a function for this.