I haven't visited the site for some time (some years...). Once upon the time I created a game, uploaded all stuff. I ordered a copy, got it, played it. Then I decided to publish it. I published it. All seemed fine.
Now, I returned and I found my game to be "not" published. Hmmm. Okay, I tried to publish it (all artwork proofed, etc.).
It says (top right corner) "Error".
Nothing more, nothing more verbose....
What to do then?
I'm guessing that this was a game you published several years ago. A couple of years ago, we made some changes to our site, which included a new requirement for a Game Logo. (http://news.thegamecrafter.com/post/41207934806/new-site-design-coming-soon) Because your game does not include this item, it would have been unpublished at that time.
I would recommend subscribing to our News feed, so that you can stay informed about any changes like this that will affect your games in the future.