Pro Sites Checkout Page Option Not Showing

Hi,

The network option for Pro Site Checkout page is not showing any ability to choose an option.

When people click the 'premium' link from sub-siteback-ends they get directed to a network sub-site.

This error is occuring after a migration to Multi-DB?

I have tried deactivating and re-activating the pro sites plugin.

Current pro sites version is 3.4.1

The 'edit checkout page' link url is actually:
/wp-admin/network/admin.php?page=psts-settings (the same page as the network options I am clicking on it from.)

Any ideas?

Cheers,

Johnny