There are 2 possibilities:

1. You left the broswer open in a table and you forgot to press leave the seat. If this happened, then you were posting the blinds until you lost all your money.

2.Someone stole your password. (If you log in from a public pc and you don't log out, then everyone sitting on the pc is able to play with your account)

maybe u had that money in March.At the end of a month the game resets for the next month

I had the same problem. Was at about 550.000 at March 30th night. At March 31st when I wanted to see, if I was still in Top 100 about 70k had dissapeared. (Wasn`t playin, not at sit'n'go tables,was logged out,playin just at home) Looking at my chart it seemed as if I hadn`t played from march 28th to 30th, but I had been. And I won at those 3 days about that what was missing at 31st. Anyone an idea about that?

ummmm.... the phantom chip eater had them for breakfast?