I just played a game, and it has re-set me to 0 day's played.
I was at 28 or 29 days played as of yesterday. The day has rolled over, and I am now at 0 days played even though I just played a game.
Something has screwed up, and I should be current with my day's played at either 29-30.
The only difference here is that I have logged in on a different computer, one at my parents house. Logging on at a different location shouldn't cost me 30 days worth of credit, and the exp that comes with it.