Hi mate you don't have to upload the images to fm-base.
When clicking the image button, select the url option and the add the direct url of your imgur image. should look like this sort of format: http://i.imgur.com/XyIfF.jpg?2
I find it helps to untick the 'retrieve file refernce locally' button too.
Should be quicker than uploading to our servers.
Any problems give me a shout.