Comment 80 for bug 207072

Main Menu: Right-click on a panel -> "Add to panel" -> "Main Menu"
(a single-icon windows-style start menu with "Applications Places System" inside)

Yes, i'm sure.
I upgraded to hardy-proposed and experienced this. That's a bunch of updates, so i
downgraded to hardy + hardy-updates + hardy-security again (problem gone),
updated only gvfs and gvfs-backends to hardy-propsed (problem there),
downgraded them again, problem gone.

gvfs version before downgrade is
0.2.4-0ubuntu2

The "Applications Places System" menu displays bookmarks under "Places", IMO that's why it's affected.

Have you tried reproducing it? Add smb://10.58.13.6/ (or any unreachable net) to your nautilus bookmarks.