I realize that neither the 2.1.2 version nor the 2.1.3 (a recently published patch version) state that they are compatible with 2.8.6 (just released a couple days ago); however, many people have reported success with slightly older version. So I thought I would give this a try.
I tested both versions of this plug-in on a 2.8.6 version of WP and on a 2.8.5 version as well. In all cases the result was the same. The subscription parts worked fine. The subscription emails send out as well when tested; however, the Subscription Manager links made available to subscribers and to post authors do not work. When clicked they send all back to the homepage.
If I directly access this URL (http://www.hairextensionsreviews.com/?wp-subscription-manager) when logged in as the owner/administrator then I am able to successfully access the Subscription Manager. But if I use any of the provided links on the bottom of the post's comments I am put on the homepage, whether logged in as the post author, site administrator, or just a commenter.
I also feel like something else is missing. The plug-in does not seem to have an "options", "settings", or "configurations" panel. When I view it under "Manager Plugins" I see only links to Mark's and Scriptygoddess' websites. The documentation makes a reference to such an options page, but I can't find this:
"text can all be customized in the options (Options -> Subscribe to Comments)."
Since this has worked for so many, I tend to think that my minor version upgrade cannot be the problem. Please help me figure out what I am missing. I have not customized the plug-in at all. If you have a moment, please check out the results on my testing ground website. Thanks in advance for any feedback!