Here is what I did to make the splash screen display every time:
(unfortunately, you will need to edit the plugin code)
Inside:
class-wp-splash-page.php
Make the following change to this function:
public function is_active() {
if (is_front_page() )
return true;
}
Then goto WordPress Dashboard Settings -> Reading:
Select Your Latest posts for the front page displays.
Now, the splash page will load every time no matter what.
The only way is to use an FTP client (like filezilla) and manually delete the plugin directory. That will restore your wordpress site back to normal.
Edit: not the whole plugin directory – just the nRelate subdirectory.