GNOME launchers execute twice on double-click from Nautilus?

[Joe Holloway]

When I double-click to activate a launcher from within Nautilus, it
frequently launches the application twice.  I've reduced the equation
by creating a dummy launcher that just executes a "sleep 3".  Here's
what I've found:

If I double-click on a launcher sitting on my desktop (outside of
Nautilus), it always behaves as expected and launches once.  The same
if I highlight the launcher on my Desktop and press "Enter".

However, if I navigate to the launcher sitting in /home/joe/Desktop
(or anywhere else in the file system) using Nautilus and double-click,
about 1/3 of the time it launches two terminal windows instead of one.
 If I highlight the launcher and press "Enter", it always behaves as
expected and launches once.

I suspect this is a bug in Nautilus, but I couldn't find the right
combination of keywords to score a hit.    Is there anyone in
ubuntu-users land that can confirm this behavior?

Thanks,
Joe