I tried 1.8 two weeks ago. I got two bugs in org-drill:

1) When doing the quizz for some cards I get prompted for a date.
2) More annoying I got entries pushed for review in 8000 days.

1 is a nuisance, 2 made me downgrade.

I have attached the drill file I was using.

-- 
Daemons loose in system.
    -- BOFH excuse #27

I am listening to "The Mamas & the Papas - Go Where You Wanna Go".