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I've been a member for a little over a year now and I've noticed that when I check the box for auto login upon visiting the website, it unchecks itself after a couple days. Not sure if there is a way to fix this or not, but it happens randomly. Sometimes I can go a week without it changing, sometimes it reverts back to login required after one day.
Its not really a bug persay, but it does exist. Other then that, I love the website and you've made some great changes over the past year, so keep it up.