Read posts not remembered between computers

The last visit date is stored in a cookie so that for members who do not login or people who view the forum as guests also have the option of viewing new posts since their last visit as well as having the read/unread posts feature.

The read/unread posts feature is always going to be a 'best as compromise' feature rather than being 100% perfect due to the way HTTP sessions work. The only way to make it 100% perfect would be to store the data on read/unread posts in the database, but then your database would be enormous with all this extra data, web hosts would be kicking you off for using 100% CPU load, and you would be complaining that pages took 10 minutes to load.

There is an issue with the read/unread posts system if you move between computers which is being looked into to see if any improvements can be made.