A WebmasterWorld thread has confirmed reports that Google has slipped up majority with payment to their Australian and New Zealand publishers. Google AdSense has inverted the exchange rate, to pay publishers more than 20% less than what they should have been paid this past pay period.
For example, if an Australian AdSense publisher earned $1,000 US dollars, they should have received a check for about $1,139 AUD (Australian Dollars). Instead, the currency exchange rate was flipped the other way and they received $878. So they received 88% a rate, as opposed to a 114% rate.
AdSenseAdvisor confirmed the billing issue and said:
Our payments team asked me to let you know that they're aware of this conversion issue with AU currency payments, and will be contacting affected publishers shortly.
Thanks for your patience, and we apologize for the confusion.
Google might just make the adjustment during the next pay period or they may send out payment before.
Like noted in the forum thread, if this was for a different currency, the results could have been much more extreme.
Forum discussion at WebmasterWorld.