Hi Dennis, you posted on Facebook as well so I’ll paste my reply from there:
Our plugin itself cannot cause a redirect loop, but maybe there are other elements on the site that are. It could be an SSL issue; if the site is https sitewide, make sure that under Settings > General as an admin that the URLs there use https as well. Or maybe you tried to use our redirect module to redirect to a page that is itself redirecting to the login page (perhaps with a membership plugin redirecting users to log in when they don’t have access). Disable the Toolkit temporarily (as you’re doing or by FTP) and then, while signed in as an admin, reenable and disable the login redirect and front end login modules. Now, without logging yourself out, use an incognito window instead to see if you still have the redirect loop. If you don’t, try reenabling the modules and see if you can trace what might be causing the loop; check settings for whatever page you are redirecting too. You could also leave our modules disabled and try another login and/or redirect plugin, but it’s likely you’ll see similar issues with an alternative. The issue is not going to be with the plugin itself.