I'm having a hard time understanding the "Show Unread" functionality that is in the User Block - yes, this is probably a SMF issue and there is a lot of discussion over there about this (perhaps too much).
On my site, I'm using a block of type "Recent Topics" and things show up there with a blue "New" icon when someone posts (good).
However, when people (not the person who did the new post) hit "Show Unread" - the new post doesn't always show up in the list? (bad)
Also, clicking the "All Unread Posts" doesn't show all unread posts ... especially posts in child boards. (really bad)
I've tried cleaning out all the browser cache and even rebooting all the machines - but the "Unread" post behaviour (1.1 / RC1) is consistently not working. Any ideas of what to look at next?