The only "logging out" issue I know about is non-arcade related. Tends to happen on my site if someone is playing a game that literally takes over 5 minutes to play. The games are all flash and therefore fully loaded onto the visitors PC so the "playing" of the game does not get noticed as "activity" by vbulletin so the user is auto-logged out of the site. When hitting SUBMIT SCORE when they complete the game, the forum realizes they aren't logged in and requests the login. The way people avoid this issue is by making sure they click the REMEMBER NEXT TIME box when they log into the site upon that visit.
To sum up my reply, I don't think the logging out is an arcade issue, its a "lack of activity" issue of the user. Same thing would happen if it took them 10 minutes to hit the SUBMIT button on a typical post after they had hit the REPLY button. (But this issue might not exist anymore due to AJAX, dunno.)
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