atladsenser - 9:41 pm on Nov 6, 2011 (gmt 0)

From reading the AdSense help forum threads on this issue (and cziffra is right, there are tons of posts there), it seems we're far from alone on this. It's possible there is some issue with Google's systems updating payments and perhaps it may get sorted out in a few days. My finalized earnings are always slightly lower than estimated earnings, but usually by no more than few dollars to $20 or $30 tops. This month, they're off by nearly $100. So I feel your pain too.