Then it's not CB. Something is wrong with your installation or hosting environment.Login via joomla shows users offline. Session duration is 15 minutes and method is DB.
Everything has to be tested. Please try a fresh install of just Joomla + CB in a sub-folder or sub-domain to rule out modifications or 3rd party conflict.How is SEF relevant?
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Determine what is equal on the two problematic sites such as if the both have the same XYZ extension installed but working site 3 does not; that could be the culprit. That should help pinpoint the possible and likely conflict.That should help narrow down the cause!
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