I'm not sure this is a bug, as this is the part of the way it was designed to work (however questionnable...).
Hereafter an exceirpt from the manual (Logic Studio 8 ) :
I'm double clicking the marker in the global tracks area... when I click the ruler area reserved for markers, it doesn't trigger any marker activity.
When I double click the marker, it lets me change the first line (title) of the marker. And it does not erase the rest of my text. If I option double click the marker, then it opens a text box for editing.
I don't remember this being a problem in L8, but it looks like it works well in L9.
Rich
I don't see the problem in L8 either.
There are keycommands to access the marker text-window; so no need to make this mistake a second time, I think.
Nick