"As soon as I pushed the button to upload my C3 got a message something like, unable to build center image."

BAZ, same thing happened to me just a few minutes ago. Same SITO error message. The image uploaded okay (you're looking at the upload to Gridcosm, I linked to it) TCA owns c3 now, and my poem entry is there, but 1549 is still broken and1550 didn't happen.