There's a bug whereby the most recent crossword that goes online is not displayed on the crosswords page. It needs the next crossword that goes online after it to knock it onto the page. (After which that next crossword has to wait for the next, etc.)
This applies not only to the main "newest crosswords" page, but also to the category pages. So the most recent crossword to go online in History will show up on the main, uncategorized page, but it won't be displayed on the History page until the next History puzzle goes up.
This doesn't make much of a difference in categories like General where the crosswords come thick and fast, but in categories without much traffic, it can lead to a fairly long wait before a puzzle is displayed everywhere.
My guess is that this is what happened to your crossword. The bug is on Terry's to-do list; unfortunately, that list must run to hundreds of pages by now ...
Just because there's twilight doesn't mean we can't tell the difference between night and day