It seems to be working for me on the computer using Firefox. However on an Android tablet, using the Chrome browser, the "new" indicator is missing on chihuahua-puzzle.com, but present on chi.lexigame.com. Which site were you using, TRex?
I have a feeling such issues have come and gone in the past, without me being able to work out what was going on. It could be to do with browser settings for cookies.