Works fine for me. You're probably putting the link to the imgur page in the IMG tags instead of the direct link to the image.
Use [IMG]http://i.imgur.com/iObBLxz.png[/IMG] instead of [IMG]http://imgur.com/a/T1sDs[/IMG]
To get the direct link from the imgur page, right click on the image and select "Copy image address" in Chrome or "Copy link location" in FF.
Last edited by gregorio; 09-02-2017 at 02:02 PM.