I've done a lot of searching, and I suspect that I'm out of luck here, but I thought I'd give you geniuses a chance to see if you've got any ideas.
I'm trying to automate clicking and dragging a column header in Final Cut's clip browser. It just won't drag the header, no matter what I do. The column header changes color to show that it is, indeed, being pressed down. But it just won't move.
I tried separating the button down, move, and release actions, with some "Pause"s. I tried moving a small amount at a time. I tried "Set Action Delay".