Signup/Preview problems with X Theme

Hi all… I’m using GD with theme.co’s X Theme (Integrity stack), which incorporates a template system. The default template I’m using for posts/pages — as well as GD listings — is a regular content-left/sidebar-right template, while my front page uses a full-width template and incorporates a full-width slider at the top. I also have the X Compatibility plugin activated.

That being said, when I go to the signin/register page I find that it’s using the front page template instead of the default.

Also, when adding/editing a listing, I get a blank page when clicking on the “Review Listing” button that takes me to the Listing Preview (see screenshot).

Any ideas as to what the problems might be?

Thanks in advance!!