Has your site been upgraded? When? From what version(s)?
If you've upgraded, HOW did you upgrade? (official upgrade procedure or an automated script from your hosting company?)
What plugins/addons have you installed? When? If your problems are payment-related, what payment module(s) are you using? If it's shipping-related, which shipping module(s) are you using?
HOW did you install Zen Cart? (upload via FTP and run zc_install, or a one-click install from your hosting company? (one-click installs might mean you don't have enough information about your site/server to make customizations easily))
What version of PHP and MySQL is your server using? (See Admin->Tools->Server Info)
WHEN did the problem "start"? How does that compare with other events of your hosting company, changes you've made to your site files/addons, or your admin settings, etc?
Please post the contents of related "debug logs" generated by Zen Cart (wrap the content in
tags please!).
If this is your first store, have you tested all aspects of transactions before going live?
In what ways is your site customized or different from a brand new uncustomized install?
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