After researching the imgur problem it appears they have been banning websites that hotlink to images! Below is a response on another forum that appears to suggest that Imgur blocked their website because they thought they were infringing the terms of service, however someone raised a ticket and the response is posted below.
Maybe F1technical is blocked the same way, all the imgur images I cannot see return a 403 error (forbidden).
Thank you for writing in. I apologize for this inconvenience. Unfortunately that site has been blocked from hotlinking due to multiple instances of abuse of Imgur's terms of service. The terms of service can be found at http://imgur.com/tos
. We don't allow hotlinked images being used as content for other websites.
Looking into the website. The content has been used in forums, and not in any other fashion. I have removed the block. Please be sure that any blog posts shows content from imgur using our embed code.
I do apologize for this inconvenience. Please allow up to 24 hours for this to roll over.
I have now contacted their support to see if we are blocked and requested to be unblocked....