W3 Total Cache is a great way to speed up your WordPress site, however, you have to be careful with what options you have turned on when running a dynamic membership site and membership plugins like Memberium.
For Memberium to work properly you must turn OFF the following in W3 Total Cache:
- Turn Off Page Cache
- Turn Off Browser Cache
- Use Database Cache With Caution
You can safely use the CDN features, minify options and the object cache. Page caching can cause major problems and should be avoided.