This plugin was a must... Now it's very old and all the bugs listened on the support page are just ignored.
Be very careful if you use this plugin in a site with a lot of users... If you use this plugin in a site with 200 users then each page loaded will trigger 200 queries + your normal site queries. (This happened to me on a site with +7000 users... On the plugin I fixed the problem using the right wordpress's API and just switching the function used... but well support is dead and no modification has been made).
But there are still a lot of other bugs
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