If you are using the PayPal extension, there was a function name conflict in WP-Members 3.4.1 that will cause a PHP fatal error. This will ordinarily manifest itself as a message indicating “There has been a critical error on this website.”
This issue was discovered within a few hours after the initial release of version 3.4.1 and a fix was released shortly after this as version 3.4.1.1.
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