I'm running the nightly development build from 2011-02-21.
I might be misunderstanding what is supposed to happen, but when I login using the login form on the front page of my installation, it still shows the login form instead of the logout option.
I've tried it with my admin account and another user account but it's the same thing.
The login has worked, because if I then go to the admin panel I have access, but it seems that the user side of the website doesn't detect it?
Is that supposed to happen?

What theme are you using?

Default

Try not using the html caching plugin.

Thanks for the reply guys But it wasn't enabled, so the problem is still happening.

Also, after completing registration by clicking the email link, it stays on the register page instead of redirecting to the main site, not sure if it's supposed to do that.

For the logout problem try clicking on [i]apply[/i] on the plugins page. But before you do that, please look in your database--options table and find any options for which the name resembles zp_plugin_user_login-out and report back the contents of the records.

As to the registry, there should have been a logon form, but I suspect the first issue prohibited that from showing.

zp_plugin_user_login-out has the value 129 in the database.
Clicking apply on the plugins page didn't help.

Check your CGI logs. The database value is correct and would enable the plugin. So if it is not showing up there must have been some error. Suffice it to say that I cannot reproduce this error.

It turns out I'm just an idiot! I had the plugin show_not_logged-in enabled
Sorry for wasting your time