The issue is related to Chrome, and their step-by-step plan to deprecate Flash. Here is an article that explains such behavior: https://blog.chromium.org/2016/12/roll-out-plan-for-html5-by-default.html
According to the article, since October all sites will require user permission to run Flash. As you might have visited http://www.emagcloud.com/ it was added to your whitelist automatically. Now the eMags are published to https://www.emagcloud.com/, and you need to add this website manually by going to chrome://settings/content/flash and Click Add under Allow option.