Can you attach the survey here, please?

There is a failing example on your live demo

The demo installation is purged periodically. Please attach the survey here instead.

I have the same issue on Chrome & Safari (on Mac) and Chrome (on Windows). It's working fine on Internet Explorer for me. I attached a small demo.

Great, thanks!

Which version of Internet Explorer? OBS: Edge != IE.

I have the same issue on Chrome, just tested it. Worked fine with my previous version 3.9.x, I upgraded to 3.12.1 today and it does not work anymore. Here the discussion:
https://www.limesurvey.org/forum/installation-a-update-issues/115573-survey-loops-round-to-start-without-confirming-completion

IE 11 works fine
Chrome does redirect to the survey start, not to the respective End URL
Ups, Edge (42.17134.1.0) doesn't even do anything when clicking on next to get into the survey!! Seems to be another bug!

My version numbers are:

On Mac:
Chrome: Version 67.0.3396.87
Safari: Version 11.1.1 (13605.2.8)

Windows:
Internet Explorer: Version: 11.0.9600.18977 (really IE, not Edge)
Chrome: Version 67.0.3396.87

Again : ajax mode issue … deactivate ajax mode : redirect is OK …

btw: the mantis notification e-mails do not reach me

Tested with ajax mode disabled and the redirection works, BUT the {TOKEN} is not replaced in the url

I'm not clear if this is exactly the same issue, but on submit Edge is not saving survey results (saves an incomplete response with no answers) and loops back to the start. This is without any end URL redirect, on 3.12.1.

Initially reported/discussed here:-
https://www.limesurvey.org/forum/installation-a-update-issues/115573-survey-loops-round-to-start-without-confirming-completion

@mills : here it's about end url redirect.
@TonisOrmisson : Then 2 bug : one with redirect not working + one with {TOKEN} not replaced :) (did you try {TOKEN:TOKEN} or anything in survey ?)

{TOKEN:TOKEN} works, yes thanks

It's a pleasure ;) (still an issue, but 1st one to fix is no redirect)

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=27510

Now : redirect can show a white page …
Please : fix in javascript, not in php.

@DenisChenu, this didn't break after you commit "Fixed issue : unable to use Survey::model in command"?

@DenisChenu, also please specify how to reproduce the white-page problem. Thanks.

Version 3.12.3+180627 released