On Monday I mentioned the prospect of problems at US banks which had been using Fannie and Freddie stock as part of their regulatory capital - here's a bit more detail:

PNC Financial Services Group, for instance, warned in a regulatory filing it expects to record a "significant other-than-temporary impairment charge"... with an aggregate cost of $80 million...

LSB Corp., the parent company of River Bank, reported that it expects to record a non-cash charge in the September quarter...

Cascade Financial Corp. warned that it expects to record a non-cash, after-tax charge to its income statement related to its investments in Fannie and Freddie preferred issues for the September quarter. The total potential remaining loss on the company’s investment in the preferred stock is $12.1 million ...