Please update to the latest version and try again. Thank you.

Same problem with the latest Version 4.1.13+200325

@jayce : inherited for group are not 3 ? Right or not ?

Same problem with Version 4.3.5+200721
When setting is "Inherit: On", the length is shown as 15 in the textbox field (which is disabled).
In the Global Survey Settings, it is also set to 15.

The problem seems to be in "models/Token.php" in the generateToken function.

public function generateToken($tokenlength = NULL)
{
$iTokenLength = $tokenlength ? $tokenlength : $this->survey->tokenlength;

And in the generateTokens function (which works fine, even when Inherit is on), it has this code:

    $iTokenLength = isset($this->survey) && is_numeric($this->survey->oOptions->tokenlength) ? $this->survey->oOptions->tokenlength : 15;

If I change the code for setting $iTokenLength in generateToken to match the code in generateTokens, the JSON RPC-call works fine.

@gabrieljenik, could you please take a look at this one?

PR: https://github.com/LimeSurvey/LimeSurvey/pull/1654
RC token generation should be tested as well as regular token generation (admin side), due to the code reorg

Fix committed to master branch: http://bugs.limesurvey.org/plugin.php?page=Source/view&id=30740

Fixed in Release 4.3.28+201123