Imgur bbcode images has been restored. All images are now valid without no error again.
I was about to update my thread by replacing the broken imgur images, but found out that all of them have been restored. Seems imgur guys have realized that most of their users are from bitcointalk and reddit. I hope there will be no change again on imgur so it saves my time to update all of the unrestored images for my clients. However I prefer to use talkimg instead, at least for now, to avoid double effort if someday imgur makes another joke in future.
I think this is no more needed.
You can follow up the discussion on meta board:
https://bitcointalk.org/index.php?topic=5453908.new#newWhat jayce said is the best way to go about it for now. Me I have already made up my mind that I am not using imgur image uploader again because what will happen in the future might even worst than this. I will also prefer using TalkImg for all my image uploading. And since Talkimg. com creator is even a member of the forum, it make things easier because he here with us to communicate how he will fix any error occurred in the future. Whether imgur has been restored or not I am not going to use it again.