We use W3 Total Cache Plugin on Wp + buddyPress
and recently we have installed memcached server,
2 days later I have noticed, the rate of activation for new members has dropped.
normally was 80% valid activations, and now it is only 50% and seems like it is going down.
How to disable caching of this part of the site?
I mean, the part that registeres users / activates and sent emails,
it seem like many people do not get the activation email now.