Title: Bug when Mailchimp installed
Last modified: September 3, 2026

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# Bug when Mailchimp installed

 *  [ccsd](https://wordpress.org/support/users/costasundog/)
 * (@costasundog)
 * [1 week ago](https://wordpress.org/support/topic/bug-when-mailchimp-installed/)
 * When the “Mailchimp List Subscribe” plugin is active, the My Calendar settings
   don’t save.
    [https://wordpress.org/plugins/mailchimp/](https://wordpress.org/plugins/mailchimp/)
 * If you save settings, then refresh page, the settings revert to default.
 * (MY guess is both plugins use the “mc” abbreviation so something is getting intercepted
   when trying to save My Calendar settings.)
 * Tested on 2 installs, all other plugins deactivated, WP 7.1, PHP v7.
    Error logs
   don’t show any errors.
 * The page I need help with: _[[log in](https://login.wordpress.org/?redirect_to=https%3A%2F%2Fwordpress.org%2Fsupport%2Ftopic%2Fbug-when-mailchimp-installed%2F%3Foutput_format%3Dmd&locale=en_US)
   to see the link]_

Viewing 1 replies (of 1 total)

 *  Plugin Author [Joe Dolson](https://wordpress.org/support/users/joedolson/)
 * (@joedolson)
 * [1 week ago](https://wordpress.org/support/topic/bug-when-mailchimp-installed/#post-19010823)
 * Your guess is pretty likely. I’ll investigate and see if there’s anything I can
   do about it. (Changing the prefix may be possible, but it would depend on the
   specific issue.)

Viewing 1 replies (of 1 total)

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 * 1 reply
 * 2 participants
 * Last reply from: [Joe Dolson](https://wordpress.org/support/users/joedolson/)
 * Last activity: [1 week ago](https://wordpress.org/support/topic/bug-when-mailchimp-installed/#post-19010823)
 * Status: not resolved