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After I click "Save & next" on the create autoresponder page, I see a blank page with only sidebar and header content. Nothing else appears.
The new campaign appears under "Existing autoresponders" but clicking to edit it shows only the same blank page.
I'm using Version 2.0.7. Everything else works fine.
There are no known issues with setting up Autoresponders.
Try re-uploading Sendy and make sure all necessary files are uploaded:
Download the full build of Sendy from http://sendy.co/get-updated (use the form right at the top to download the full build of Sendy).
Then re-upload all of Sendy's files to your server (except /includes/config.php and /uploads/ folder) replacing the old ones.
Make sure all necessary files are uploaded.
That fixed it, thanks very much.