Redirect loop due to conflicting settings

It's possible to cause your site to go into a redirect loop if you do the following:

Check "Switch back to http pages when there are no matches"
Select "Make secure only the listed pages."
Check a role under "User roles"
Log in as a user that is assigned to the checked role

When a user logs in they are redirected to https. If this redirect does not match one of the items in the "Pages" box then securepages will redirect them to http. Repeat until you disable the module.