I see there is a login issue after the 8788 update, but none of the solutions worked for me. I also uninstalled 8788 and still customers cannot login.
/template/persistent/customer/form/login.phtml is the file that shows. I also turned the theme back to base & default and still cannot login.
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an issue with magento 1.7 on php 5.4. Fixed by going to earlier php version
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