AMS made a post about this eariler today
http://www.heromachine.com/forum/account-issues/trouble-uploading/#p45068
Apparently he already spoke to Jeff about it who thinks it is a FTP server issue and suggested trying again later. If this problem is still around tomorrow I will contact Jeff about it again myself. In the meantime you can always upload to another site like photobucket or Deviantart then post the Direct link URL here in img tags, using the img button in the post toolbar like the example below:
