| It's done automatically when you log out, which normally happens if you leave the site open for too long (to prevent keeping a lot of unused connections open, which would end up slowing the site down for everyone, or something like that). Basically, when you log out, the system consider you have seen everything, and when you log on the next time, it shows what have been modified during your absence.
I'm not sure if it can be changed though, at least without recoding some stuff...
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