I just noticed that after I enabled my two monitors using beta 14, Windows XP's SP3 Display properties Settings tab is not updated with the new info. DF did successfully activate the monitors. See the two images below.

See the attached images. A bit of detail is that I turned used the Windows display tab to remove the two monitors from the desktop. 5 days later, I used df to put them back on the desktop.

BTW, Windows eventually figured it out and now shows what df did. This is a day later that I''m report that, so I can't say how long it took precisely. Certainly more that the half-hour between the change and me noticing that df showed a 3 monitor configuration and Windows still showed only 1 monitor.