The login direct is handled by CB login module.
It appears the JoomSEF is creating a SEF url for the CBSubs link incorrectly, redirecting all the following to the same members/pluginclass URL:
index.php?option=com_comprofiler&do=displayplans&plugin=cbpaidsubscriptions&task=pluginclass&Itemid=347
index.php?option=com_comprofiler&plugin=cbpaidsubscriptions&task=pluginclass&user=551&Itemid=347
index.php?option=com_comprofiler&cbpaccount=expired&plugin=cbpaidsubscriptions&task=pluginclass&user=551&Itemid=347
When I exclude the redirect link from JoomSEF, it displays the renewal option correctly.