Hi Mike,
This could be happening for any number of reasons. One may be that you created a custom screen who's "go to" links are taking the user to other screens that the user does not have permission to access under that role. In this case this is a permissions issue. Do you receive any error messages or do you get a blank page?
If you would like hands-on troubleshooting and customization support, feel free to reach out to me directly, however please note that because this issue pertains to custom screens, and not one of the default Method screens, we would need to charge you for premium support and customization.
Regards,
Denis