I know there was a forum update. Since then, I've been prompted 2-3 times to accept cookies. It's not a problem. I just thought I'd mention it in case the cookie expiration isn't right(? I haven't seen forums prompt more than once unless a new software install, cookies were cleared, etc.).
Edit: May 14: Just happened again. It appears the "agree to cookies" cookie has a lifespan of 7 days. (Not a big problem, but shouldn't be hard to fix either.).