if i was you check into these plugins
Quote:
DNSBL/Open Proxy Monitoring 2.0.8 Open proxy monitoring and blocking
vBFirewall 1.0 Plugin to protect from hackers.
Real ip detection 3.8.001
vbNetwork 0.9 vBulletin Networks
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maybe one of those is blocking you from letting you staying logged in .I think its the dnsl hack.which i had some issues before, since then i removed it.