That's pretty weird... I don't know what to say is the issue.
Have you tried a different browser program?
If the URL fails, then copy and paste the direct image link instead.
Also make sure you click on the add picture instead of video link.
The picture will show up while you're making the post.
EDIT ......
I'll make this clear.
In Imagur = select the picture you want until it gets it's own window with some options on the side.... You will see the "direct link" option. Copy that.
In the forum = click on the "Image" icon, then paste the line in there. and it WILL work.
Ok, this is exactly what I'm doing...
Start from the bottom pic and it makes more sense XD Actually, don't, they are all in a completely random order. I will fix this.
Ok, fixed, if you start from the bottom pic and work up that is exactly what I did.
http://imgur.com/rVRfJvd
http://imgur.com/HuhEuc8
http://imgur.com/xGyiv55
http://imgur.com/7sZN3YL
AND IT STILL DOESN'T FUCKING WORK!!!!