So...I tried uploading a 13500 x 1142 file at 13.3 or 13.8mb and Newgrounds is having a difficult time with it.

It took forever to get it to finally upload, and then after I edited the description the page won't load now.

Since you can't post without a file uploaded, I think it removed the file or maybe it got corrupted at some point, so the page is in an error state. I'll re-upload later today, that was a good few hours down the drain. Even Deviant Art is acting weird.