I also haven't received free spin yesterday. Like majority of users probably, I use Gmail and obviously I checked spam folder, but I haven't found anything. It happened for for the first time, I I always received free spins, I got it on 24th March and got it today.
BTW, one question about Daily Free WOF spin. Why there is captcha is I have Premium membership?
I also did not get a spin yesterday, but got one today. The premium membership only removes the captcha for the free BTC rolls and the extra WOF rolls you receive. You still get a captcha for the WOF spins from the email regardless of how much FUN you hold.