They are not behind on payments. I get my payment on time at the same time each month.
And to the person who says you need $100 for a payout - please stop giving out false information. The payout threshold is $50.
That said, it sometimes seems late because of the payment structure. I have gone through the same thing in the past, until I figured out just how it works.
First off, the "balance history" page is horribly formatted, and somehow manages to make something simple into a confusing mess...So I will attempt to clear it up.
Let us assume that you got paid on Oct 28th. (Payout date is always around the 28th, depending on business days I believe. I've been paid on the 29th a couple of times)
Your balance history will show something like this:
Oct 28th: Paypal payment $50.00
Balance at the end of October: $0.00
The "balance at the end of October" part makes it confusing, because it looks as if you've been paid up, and now you are onto November's earnings. But the next line:
Nov. 9 Ad Program earnings: (Oct 1 - Oct 31) $55.00
Balance at the end of November $55.00
The way it reads October earnings as a balance at the end of November gets confusing. Seeing "At the end of November" makes it look as if it is including November's earnings, but it is not.
One month I thought I was due a payout because I was adding up the "Ad program earnings" line for a month, not realizing those were from the previous month, and that I'd already been paid for it.
In short, if you are looking at "Balance at the end of December" and seeing more than $50, then rest assured - you will get a payout on or around January 28th. If you don't, then your payments aren't set up. Anybody who got paid on December 28th was getting paid for earnings made prior to December 1st.
I've been making payouts almost every month since last April, and have never had a delay, just a few blips on my part when I misread my earnings statements after a Google slap caused me to not make payout.