If you're using Aweber and want to be redirected to the Current page as a thank-you page, You will encounter some troubles.
Instead of being redirected, your subscribers will discover an error page like this one :
The problem is due to some javascript code on the aweber forms."An Error Occurred
The form you used to subscribe is not set up properly.
Please push the "Back" button and notify the website owner."
To solve it, you have to change 2 things on WP Subscribers :
First: in the hidden field on "Setup Opt-in Code", replace :
<input type="hidden" name="redirect" value="" />
By this line from your Aweber form code :
<input type="hidden" name="redirect" value="" id="redirect_1082xxxxxx" />
Then: add this code to your Opt-in Popup (in the field "Custom jQuery"):
jQuery('input[name="redirect"]').val(document.location);
Thanks to JC who find this nice solution