BECU, a credit union in Washington, alerted its members this week that banking transactions can once again be downloaded in Quicken 2007 for Mac and previous versions. In mid-December, BECU updated its Web site's certificate to use Extended Validation (EV), which provides greater credibility to a secure certificate. (See "Quicken for Mac Lacks Extended Validation Certificate Support [1]," 2008-12-23.)
Whatever the change was - BECU attributes the fix to Intuit - it worked fine and I'm once again able to download transactions.
It's still unclear how quickly Intuit intends to update Quicken 2007, the current latest release of personal-finance software for Mac OS X, and whether the company will fix earlier versions of Quicken, too. Intuit said that the upcoming Quicken Financial Life for Mac [2], due out in mid-2009, will incorporate correct EV support. The new software will require Mac OS X 10.5 or later, and thus won't be appropriate for all current Quicken users.
[1]: http://db.tidbits.com/article/9964
[2]: http://quicken.intuit.com/personal-finance/mac-personal-finance.jsp