I thought I was going to receive payment this month. Adsense support says:
Since last payment drop-down incorrect
Details: Publishers who have switched to local currency reports and who have gone through the balance transfer process will notice that the 'Since last payment' dropdown on the Reports Overview page is displaying incorrect amounts. The earnings amounts displayed will not include the amount of the balance transfer. However, this is only a display issue, and hasn't affected publisher earnings or payments. Once a publisher has been sent their first payment after going through the balance transfer process, the 'Since last payment' dropdown will display the correct amount.
Workaround: To view your unpaid earnings since your last payment, add the balance at the end of last month (found on your Payment History page) to your earnings from the current month. You can calculate your earnings from the current month by running a 'this month' report in the 'Advanced Reports' section of your account.
For instance, to calculate your unpaid balance as of July 20, you'd add the 'Balance at end of June' amount listed on your Payment History page to your July earnings accrued between July 1 and July 20. In this example, the 'Balance at end of June' amount would represent the total unpaid earnings in your account up to June 30th, but wouldn't include your July earnings since the month had not yet ended.
3 month view on Payments page showing incorrect balance
Details: Some accounts may see an inaccurate balance when viewing the 3-month view on the Payments page. This can happen for a number of different reasons, which vary from account to account.
Workaround: Select the "All Time" view and you will see your correct balance.