Redirection in CoursePress on Multisite prevents action on init?

I've created an integration between WordPress and GoToMeeting and embedded a shortcode into a CoursePress post. I've been able to get these steps to work in a single site (non-multisite):

1. Embed shortcode in post which links to http://home_url/index.php?<postvariables&gt;

2. Upon clicking the link, I've added an action on init looking for certain post variables

3. If it finds the correct post variable, it makes a call to GoToMeeting to get the correct URL and then redirects to that URL.

The trouble I'm having is that when I move that to multisite, still using CoursePress, it redirects to

https://home_url/?<postvariables&gt;

(SSL intended)

It just displays the site home page and never hooks on init.

Do you all know if there is a difference about how the init hook works in multisite? Or potentially how CoursePress is interacting or redirecting in multisite from a single site?