I just tested a picture from your site and it is working fine.
Here’s what I did,
I paste this link in my post
I then HIGHLIGHT the above link with the mouse.
I click the IMAGE button that you can find on the right hand column.
After you clicked the IMAGE button, you will see the above link being enclosed by
Click the SUBMIT post button and you should be able to see the picture showing up in the post.
Please give it a try again and let’s see what happens.