sasch9r

I haven’t tested it yet, but you could try something like this:

Put this in front of plugin’s code:

global $user_ID;
get_currentuserinfo();

if ($user_ID) {

And after the code you could try this:

}
else {
# This part should be empty i thin.
#So non-admins can't use the plugin's functions.

}

2 ideas:

you use the new sub-installation (i dont know anything about that, sorry) OR you install the maintenance from here

https://sw-guide.de/wordpress/plugins/maintenance-mode/

You made something wrong. Did you delete all files before, before uploading the new ones?

<?php the_tags('before', 'between ', 'after'); ?>

<?php the_tags('Tags: ', ', ', ''); ?>

It will look like:
Tags: WordPress, Dexter, New Version (break)

Just activate the Default Theme of WP, then you see how it looks