Brendan et al., when I completed the crossword yesterday, I also received a congratulations and all the parsing, but with no submit button. I re-entered all the answers today, and was able to submit it successfully.
Having grumbled on this thread, I now find that I am one of the (randomly chosen) winners of Gemelo 21. An email from the Observer reached me in the middle of the Drake Passage, returning from Antarctica - as you do…