Title: Plugin Caused Instability in WordPress Admin (404 Error Pages) Last modified: August 31, 2016 --- # Plugin Caused Instability in WordPress Admin (404 Error Pages) * Resolved [Michael Samson](https://wordpress.org/support/users/illuminice/) * (@illuminice) * [10 years, 2 months ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/) * Hello, * I just installed your plugin on one of our client’s websites, and immediately ran into stability problems. * Our client has an extremely fully featured website, running many other plugins. We’ve never seen any kind of conflict up until now. * When I installed the plugin, it seemed to cause an instability in the WordPress admin. What was happening was that many admin pages would redirect to the front- end website with a 404 error. Sometimes this occurred when just clicking on an admin menu, and other times when trying to save something in the admin. * I did a lot of testing to confirm the calendar plugin was the cause. For some reason it is just unstable in our client’s admin. I should also mention that they have the latest version of WP and all of their plugins. * This is unfortunate, as your plugin is exactly what we need for this client. Now I must look for an alternative. * ~ Michael * [https://wordpress.org/plugins/google-calendar-events/](https://wordpress.org/plugins/google-calendar-events/) Viewing 8 replies - 1 through 8 (of 8 total) * Plugin Contributor [Nick Young](https://wordpress.org/support/users/nickyoung87/) * (@nickyoung87) * [10 years, 2 months ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7228682) * > I did a lot of testing to confirm the calendar plugin was the cause. For some > reason it is just unstable in our client’s admin. I should also mention that > they have the latest version of WP and all of their plugins. * Can you tell me how you determined that? Did you go through this doc? [http://docs.simplecalendar.io/troubleshooting-theme-plugin-widget-conflicts/](http://docs.simplecalendar.io/troubleshooting-theme-plugin-widget-conflicts/) * Thread Starter [Michael Samson](https://wordpress.org/support/users/illuminice/) * (@illuminice) * [10 years, 2 months ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7228687) * Hi Nick, * It was very easy to determine. The moment the plugin was installed the entire admin became unstable. There were no problems of this kind before that. * I was able to reproduce the problem over and over again with the calendar plugin installed and activated. As soon as I deactivated it the problems in the admin disappeared. It was clearly the cause. * This is obviously some kind of conflict, but I am working on paid hours and cannot take the time to start figuring out what other component is involved. If you like I can provide a list of their installed plugins though. * I’m really frustrated right now because the client approved the use of your specific plugin, and there doesn’t seem to be many quality alternatives out there. * This was supposed to be a fast and simple job, and I only had a few hours to complete it. * ~ Michael * Thread Starter [Michael Samson](https://wordpress.org/support/users/illuminice/) * (@illuminice) * [10 years, 2 months ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7228689) * Here’s a full list of their plugins… * Admin Menu Editor Pro Akismet Cmssuperheroes Contact Form 7 Custom Login Custom Post Type UI Essential Grid Google Analytics by Yoast Google XML Sitemaps Revolution Slider Simple Custom CSS Timetable Responsive Schedule For WordPress WPBakery Visual Composer Yoast SEO * ~ Michael * Thread Starter [Michael Samson](https://wordpress.org/support/users/illuminice/) * (@illuminice) * [10 years, 2 months ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7228837) * Hi Nick, * Do any of the plugins I listed above stand out to you as potential conflicts? * I’m afraid I will have to source a different plugin if I can’t get this one to work quickly. We simply can’t start deactivating all of the plugins or switching themes just for testing purposes. It’s simply too risky and disruptive to the client’s website. * I really do want to get this working as it was the best solution. But looking for the source of a conflict is like looking for a needle in a haystack. * ~ Michael * Plugin Contributor [Nick Young](https://wordpress.org/support/users/nickyoung87/) * (@nickyoung87) * [10 years, 2 months ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7228846) * You could try refreshing the permalinks to see if that maybe helps. * The biggest thing here though would be the need to check if there is a conflict with another plugin. There is not much we will be able to explore if that isn’t done. The reason is because one of the other plugins could be where the issue is coming from and not necessarily coming from our side. So we would need to isolate that if it’s the case to even know what is going on. * Thread Starter [Michael Samson](https://wordpress.org/support/users/illuminice/) * (@illuminice) * [10 years, 2 months ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7228857) * Hi Nick, * I appreciate your fast responses… * I’m going to give this one more try, to see if I can determine the source of the conflict. I’m hoping it’s a plugin. She only has 14 of them, so it shouldn’t take too long to test this. * If it is a plugin, I may need your help to resolve the issue. We can work together on that. * The problem manifested itself as 404 errors in the admin, when clicking on just about anything. About 50% of the clicks resulted in a 404. * Do you really think the permalinks are involved? * I’ll get back to you on this later, or over the weekend. * ~ Michael * Plugin Contributor [Nick Young](https://wordpress.org/support/users/nickyoung87/) * (@nickyoung87) * [10 years ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7229065) * Hello, * I am going to assume this has been resolved since there has not been a reply here. If you continue to have issues please let us know and we will be glad to continue with helping. * Thanks! * Thread Starter [Michael Samson](https://wordpress.org/support/users/illuminice/) * (@illuminice) * [10 years ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7229066) * Hi Nick, * I actually was never able to solve this conflict. I did further testing and could not resolve the problem. I tried updating all software, including WordPress and all plugins, and the problem still remained. * We ended up going with another Google Calendar plugin, which was similar to yours but didn’t have any conflicts. I simply did not have the time to do further testing, as it was on paid hours. * All my best, * ~ Michael Viewing 8 replies - 1 through 8 (of 8 total) The topic ‘Plugin Caused Instability in WordPress Admin (404 Error Pages)’ is closed to new replies. * ![](https://ps.w.org/google-calendar-events/assets/icon-256x256.png?rev=1263960) * [Simple Calendar - Google Calendar Plugin](https://wordpress.org/plugins/google-calendar-events/) * [Frequently Asked Questions](https://wordpress.org/plugins/google-calendar-events/#faq) * [Support Threads](https://wordpress.org/support/plugin/google-calendar-events/) * [Active Topics](https://wordpress.org/support/plugin/google-calendar-events/active/) * [Unresolved Topics](https://wordpress.org/support/plugin/google-calendar-events/unresolved/) * [Reviews](https://wordpress.org/support/plugin/google-calendar-events/reviews/) ## Tags * [404-error](https://wordpress.org/support/topic-tag/404-error/) * [wordpress admin](https://wordpress.org/support/topic-tag/wordpress-admin/) * 8 replies * 2 participants * Last reply from: [Michael Samson](https://wordpress.org/support/users/illuminice/) * Last activity: [10 years ago](https://wordpress.org/support/topic/plugin-caused-instability-in-wordpress-admin-404-error-pages/#post-7229066) * Status: resolved