Erm... ya know how places you haven't been since you last visited the forums are blue chocobos (forums) or pink folders (threads)? Well, some of those appear as gray chocobos or yellow folders anyways.

Example - last time I visited - July 22, 11 PM PDT.
Now I visit today, July 23, 3.30 PM PDT.
A thread with the most recent post at July 23, 1.00 PM PDT is a yellow folder.

Anyone know what's going on? Cookies or something?