I use a recent threads widget on my home page, and noticed that all of the identicon avatars are the same, regardless of user's IP. When I click on the link to the actual thread, a different identicon appears there and looks correct. Tried disabling caching altogether by entering a zero, but thought it was already disabled when I enabled the "new posts" feature for members. Tried enabling/disabling/enabling again, but am not sure where to look.