Ben

After poking around a little bit more, I found out this is because the plugin walks on the bloginfo function. From line 36 in sp-core.php:

add_filter( 'bloginfo', array( &$this, 'delete_bloginfo_name') , 1, 2 );

Unfortunately, it uses this to change the meta titles, so if I comment the line out the plugin becomes ineffective. Isn’t there a better way? Or am I missing something completely?

If you’re trying to place a separate install of WP in a subdomain, make sure you’ve registered it with your host. It’s not very hard, usually under your host’s cPanel you’ll find, under “Domains”, a link labeled “Subdomains”. Going through the cPanel wizard, you can create video.mysite.com, and (usually) a file path will be created — something like /myrootdirectory/video. This is where you want to put your new install of WP. Once you’ve dropped the fresh files into the folder, create a new MySQL database for the install and then visit your subdomain (video.mydomain.com) where WordPress will ask you for your MySQL database and user credentials to create a config file.

Unless you have specific reasons for creating an entirely new install of WP, I suggest you create a WordPress Network: http://codex.wordpress.org/Create_A_Network. After following their steps, create a wildcard subdomain in your host’s cPanel (i.e., *.mysite.com) — this will allow you to create as many sites as you want through the WP Dashboard.