I purchased a theme from another provider in 2011. It was supported from WordPress 3.2.x to 3.4.x. The theme was also originally installed in single site mode.
I upgraded to WordPress 3.9 (after backing up the site), and then followed the directions here on WPMUDEV to make it multi-site.
Finally, I uploaded and Network Activated the Signup Code plugin.
However, I'm not having any success in seeing the signup code on the wp-login.php screen.
I realize that WPMUDEV has no responsibility for troubleshooting this issue, but I'd love to gain some insights or hurdles that you might detect which I can bring back to the programmers for a workaround.
I can provide FTP and admin access so you can peek under the hood. I am also open to a recommendation on a WPMUDEV theme that maintains the aesthetic and eliminates the hiccup we're presently dealing with.
A 'Coming Soon' placeholder screen is presently in place while we add content before unveiling the site to the public.
Thanks in advance for guidance, insights, and recommendations!