On old versions of the plugin in fact, the logout widget link was pointing to phpBB logout not wp logout.
The trick is just to append phpbb session to an url that point to phpBB logout.
I see that you have cookie .thetopfew.com, i should test the thing to understand why the loop about cookie that should be the couse due to cookie problem, but you can try this?
Open wp_w3all.php file
search for this code
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$useragent = (!empty($_SERVER['HTTP_USER_AGENT'])) ? $_SERVER['HTTP_USER_AGENT'] : 'unknown';
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$w3cookie_domain = '.thetopfew.com';
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$w3cookie_domain = 'thetopfew.com';
try to logout and re-login.