Same here.
Seasons is no longer working since Patch Notes Week #27, I can still go to season arena by typing the url directly, but I can't claim my former and forthcoming prizes.
I'll give the url to other users here, so they can keep seasoning, until they can collect rewards:
https://www.hentaiheroes.com/season-arena.html
I have noted that:
<div id = "leaderboard_list" class = "leaderboard_list"></div>
Comes empty (InnerHTML has nothing).
And a script section after div leaderboard_tab_container is empty too. Is there something missing?
Even in the patch note the portion referring to it is miss-formatted, so I thing it wasn't quite ready to post.