same problem in Firefox also. I have multiple tasks with no priority that can't be edited with shortcuts. I have a new computer, completely updated, its a Mac. running Leopard, not snow leopard, and short cuts aren't working. My only thought is that it is a RTM site error. I'm sure they will fix it soon. But reply if your having the same problem, i'm sure that would help them zero in on the problem

haha, got it. I sent those tasks. so i guess when you send a task, it stays in your cue, but you can't modify it. interesting

This is correct: anything in the Sent list (which means it has previously been sent) will be locked, since you've basically deferred taking care of this task to someone else. But you can still see them, to see when they're completed, etc.