I've had a strange problem of late whereby when I use the Press This bookmarklet the text box is empty. The text is there because if I highlight it I can see it (albeit with a lot of tabs either side).
I have the 'Disable the visual editor when writing' ticked, it doesn't happen if I use the visual editor, that seems to be OK.
I have it setup on two of my sites and it's happening on both.
It happens in Firefox 3.5.1 (and 3.5 and I think 3.1 as well) and Chrome 2, I haven't tried IE. All on Vista.
I think it was when I upgraded to 2.8, though I can't swear to it.