I have been lazy and haven't upgraded, but I don't see this on the list of fixes for the final release, so:
I'm noticing that some of my long-time flashcards are getting their scores reset lately. It just happened to me, in fact. Here's what the card info says now:
忙 mang (A) busy
Scorefile: Default
Created: 2/23/06 10:39 am
Reviewed: 2/23/09 8:55 am (note, exactly 3 years since creation, if that's relevant)
Score: 400
Last 10: 100%
Record: 25-0
Difficulty: 104
Categories: Zi, User Dict Cards, R+W Chinese, Spoken
I happened to look at the info for this one before answering it, and its score was 20900 with a last review date in 2008 (didn't note the exact date but it seemed about right). I scored it a "6" then went back and the score was like the above. I know from recent experience that I'll see this card again in 4 days when I'd really like to see it again in more like a year.
I don't remember this happening before beta 4. Oddly, I also don't remember it happening WITH beta 4 until the last week or so, but it's possible I just didn't happen to get any really old cards for the first couple weeks after installing it.
My cards are set to repetition spacing, 100 points per day, automatic scoring, aggressiveness 3, difficulty scaling "First Increase", prompt for quality, only change once per day.
Hopefully this is fixed in the final release and all I have to do is upgrade...