If you diff the normal login/register templates with the persistent ones you will hopefully see some differences that affect the login/registration of users. – Ben Crook
Ben crook is right, but there seems to be a bug in Magento that causes always using files from persistent/customer - even when persistant cart is disabled.
When Magento merges all layout XML files base/default/layout/persistent.xml sets the template for some customer/checkout pages to persistent/customer, but this should only happen when persistant cart is enabled. To fix this add ifconfig="persistent/options/enabled" to <action method="setTemplate">
base/default/layout/persistent.xml
<layout version="0.1.0">
<customer_account_login>
<reference name="customer_form_login">
<action method="setTemplate"><template>persistent/customer/form/login.phtml</template></action>
...
</reference>
</customer_account_login>
<customer_account_create>
<reference name="customer_form_register">
<action method="setTemplate"><template>persistent/customer/form/register.phtml</template></action>
...
</reference>
</customer_account_create>
<checkout_onepage_index>
<reference name="checkout.onepage.login">
<action method="setTemplate"><template>persistent/checkout/onepage/login.phtml</template></action>
...
</reference>
<reference name="checkout.onepage.billing">
<action method="setTemplate"><template>persistent/checkout/onepage/billing.phtml</template></action>
...
</reference>
</checkout_onepage_index>
...
</layout>
From Bug: when persistence checkout turned off; then persistent/customer/form/login.phtml still being used
customervspersistant/customertemplate? And this answers you why you should usepersistantat the moment. If this is known, why ask? – sv3n Aug 05 '17 at 00:51when persistence checkout turned off; then persistent/customer/form/login.phtml still being used? You answer me for a problem that I don't need. And as I have said i don't wont to downvote, flag you – PЯINCƎ Aug 05 '17 at 01:01persistent/customerdirectory. – sv3n Aug 06 '17 at 15:08