In dev54, the captcha of backend (Admin Login and Admin Forget Password) can't display.

[SunshineTech]

The captcha can display after modifying code as following:

//Magento\Captcha\Helper\Data
/**
* Get captcha image base URL
*
* @param mixed $website
* @return string
*/
public function getImgUrl($website = null)
{
return $this->_storeManager->getStore()->getBaseUrl(\Magento\App\Dir::MEDIA) . 'captcha'
// . '/' . $this->_storeManager->getWebsite($website)->getCode() . '/';
. '/' . $this->_getWebsiteCode($website) . '/';
}

[verklov]

SunshineTech,
Thanks for reporting this issue! We have inserted it in the product backlog.

[verklov]

@SunshineTech the team has looked at the issue and reported it cannot be reproduced any more. Apparently it was fixed during this period. We are closing this issue.