For insight into why caching presents an issue, refer to the Understanding the Impact of Caching on Membership Sites page.
If you are using the WP Super Cache plugin on your site then do the following to make it work with Simple Membership Plugin.
- Go to your WP Super Cache plugin’s Advanced Settings menu.
- Check the “Simple” option for “Cache Delivery Method”.
- Check the “Disable caching for visitors who have a cookie set in their browser” option for Cache Restrictions.
- Save the settings.
See the following screenshot for reference.

Older Version of WP Super Cache
If you’re using an older version of the WP Super Cache plugin, the following screenshot shows the relevant configuration.

You should exclude the membership login page from caching.
You should also set the cache garbage collection interval to a value that is less than 24 hours.