I have tons of errors in 1.2.4, and prior my store have work perfect Emails doesn't work, in my store prestashop doesn't send any mail to any client order or registration. I have checked the SMTP parameters but they are OK. Also when someone make an order I cannot see the products he has ordered in the back office. See the pic. I also had a problem with bank transfer payment, client cannot see the bank transfer account details, I install and reinstall the module five times until this was fixed. My advice to you is do not upgrade