[Plugin: Primary Blog Switcher for SuperAdmins] cannot apply changes

The plugin is for network enabled multisite versions of WP3. The plugin will do nothing in a single blog version of WordPress but throw an error. Uninstall the plugin.

It’s a network enabled WP with 3 blogs.

Hmm, in that case, I’ve been able to reproduce the error under the following conditions:

I have installed and activated Sitewide Tags plugin, but if I remove the plugin without removing the options it creates in the db it hangs. This plugin looks for the sitewide_tags option, but not if the Sitewide tags function is active, and it hangs.

I’ve added a condition check for the sitewide tags function so it skips over that piece in the code.

From this
if(get_sitewide_tags_option( 'tags_blog_enabled' ) == '1' ) {

to this
if( function_exists(get_sitewide_tags_option) && get_sitewide_tags_option( 'tags_blog_enabled' ) == '1' ) {