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.
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...