Hi,
I have added the plugin user_login-out in the latest version (1.4.5.1) to find that only the Form option works.
The Colorbox option just adds a # to the end of the URL and puts the page back at the top. I have enables colorbox_js for all the pages except functions.php and have set the theme to "Example 3".
I don't know what to do as the slideshow plugin works but this form doesn't.
I had done this as I said, but I don't think the functions.php file needed it included?
I have fixed the problem, it was due to one of my theme's JQuery scripts using $.browser, which is not supported any longer.
Once I updated stuff, it allowed everything Javascript to work again on my site, including the colorbox!