Hi me and at least one other person are in the same situation. Last night we had our bitcoins stolen and now bitcoin.de has frozen some accounts to sort the situation out. Some of my bitcoins that could not be withdrawn were sold to two separate accounts through liberty reserve. Your account may have been one of the accounts my bitcoins were sent to and this may be the reason why they have frozen your account. I remember that the two accounts had roughly 30-40 feedback but since I can't log into my account I cannot check the names of the accounts that the bitcoins got sent to.
Did you have any unknown sales or withdrawals last night? i.e. without your permission?
