UserAgent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/59.0.3071.115 Safari/537.36

Example URL:
http://get.adobe.com/nl/flashplayer/about/

Steps to reproduce the problem:
1. Go to chrome://settings/content/flash and make sure these settings are set to the default. both "Accept that sites use flash" and "Ask first" need to be enabled. Make sure the example domain does not exist on the whitelist.
2. Open the example url.

What is the expected behavior?
Expected is that a pop-up appears asking if the site should be allowed to use flash.

What went wrong?
There is no such pop-up. On any site where you want to use flash you need to manually add it to the whitelist.

Does it occur on multiple sites: Yes

Is it a problem with a plugin? No 

Did this work before? Yes Unknown

Does this work in other browsers? Yes

Chrome version: 59.0.3071.115  Channel: stable
OS Version: 10.0
Flash Version: 26,0,0,131

sadly, i am responsible for a legacy magento store which uses flash for the functionality to upload images. Over the past few days this functionality broke, and i had to manually whitelist the domain on my colleagues'chrome installations. All my collaegues had the newest version, three of them had the problem of no popup and no functioning flash. Weirdly another collaegue was able to fully use the funtionality, even after fully clearing her cache, cookies etc. All the involved chrome installations have the same build number and flash version.