About the first part of your question. My users had that too sometimes. Mostly on games in which you play for a longer periode of time.
Cookie timeout on the forums are standard set to 900 secs. Playing Tetris for example, will take longer then those 15 mins if you are good.
So have your users check the "remember me" when they login, then their highscore will be saved.
There is also a hack around somewhere which checks the "remember me" automatically, maybe you can also achieve this by editing some template.
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