On one site I have DT Donate installed, whenever a browser uses the \"DT Donate\" menu option (SWMenuPro) and is then asked with a radio \"One time\" or \"Recurring\" -- when either is selected and then submit pressed the browser is redirected to the site home page -- Note they are redirected to HTTP:// even though the redirected from a HTTPS:// page.
Note the entire site is set as HTTPS:// through the configuration.php file:
$mosConfig_live_site = \'https://www.example.com\';
... that is used as kind of a shotgun SSL approach for making sure the pages that need SSL get it.
First off, you need to use the latest version of DT Donate. We do not support old releases. After upgrading, if you still have issues, submit a support ticket.