Hello jamjoe,
Starting from July 1st Full Tilt started to pay
rakeback weekly, but it does not affect those players who got negative rakeback, until you will be back positive. Your Rakeback for June is negative so it means that it will be carried over to the next months payment. For example if your rakeback for June was -$10 and you will generate 20$ of rakeback in July you will receive your $20-$10=$10 rakeback somewhere in August (usually before the 20th)
If at the end of this month you will have positive rakeback, you will be moved to the weekly payments for next month (August)