1/ go to the imgur.com website and login (here identified with a Twitter account)
2/ the window does not appear and i cannot to select and add an image when I click on this button:
3/ I disabled all blockages (the lion’s head is grayed out) and allowed popup windows to be displayed
4/ I disconnected my account imgur and I identified myself again
5/when I click on this button, the window still does not appear.
Normally, it is a Windows Explorer window that should be displayed
If you want additional information, do not hesitate.
Thanks for the report! I am able to reproduce this and will be relaying the information to the appropriate team. Will return when I have more information or a workaround.