Thanks, Lizard.
Re the blue, underlined single actions: When I selected one and pressed command-U, the underlining did not go away, but became darker, on all the blue actions, as if the text was underlined twice. Next I went to Format>Font>Show Fonts where, sure enough, underlining was selected. When I changed the underlining selection to none in the Fonts Panel, the underlining on all the blue single actions disappeared. Yea!
Re the unavailable gray single actions, none of them have start or end dates, and they all do have contexts. So they should be blue and available, right? For what it's worth, if I try to "force" a gray single action to be available by setting its start date to yesterday, it stubbornly remains gray and unavailable.
Last edited by alvarado; 2008-01-22 at 04:11 PM..
Reason: Keep thinking of more details. (I'll try to edit less in future.)