Repost from here:

https://bugs.launchpad.net/ubuntu/+source/gvfs/+bug/532024

When I select Places-Network and then double click the "Windows Network" directory I get a pop-up saying: "Opening Windows Network You can stop this operation by clicking cancel.
CPU usage goes up to 100% (gvfsd-smb-brows is causing this). It does not matter how long I wait, nothing changes.
When I click cancel on the dialog, the dialog goes away but CPU stays at 100%.
After a really long time (20 minutes) I get the following dialog:
Unable to mount location
DBus error org.freedesktop.DBus.Error.NoReply: Did not receive a reply. Possible causes include: the remote application did not
send a reply, the message bus security policy blocked the reply, the reply timeout expired, or the network connection was broken.

If I click on OK on that dialog it goes away but CPU stays at 100%.

So I can't enter the windows network and CPU usage is 100%.

ProblemType: Bug
Architecture: amd64
Date: Thu Mar 4 18:02:42 2010
DistroRelease: Ubuntu 10.04
EcryptfsInUse: Yes
InstallationMedia: Error: [Errno 13] Permission denied: '/var/log/installer/media-info'
Package: samba (not installed)
ProcEnviron:
 LANG=en_US.utf8
 SHELL=/bin/bash
ProcVersionSignature: Ubuntu 2.6.32-15.22-generic
RelatedPackageVersions:
 nautilus 1:2.29.91-0ubuntu2
 gvfs 1.5.4-0ubuntu1
SambaClientRegression: Yes
SourcePackage: samba
Uname: Linux 2.6.32-15-generic x86_64

dpkg-query -W -f='${Package} ${Version} ${Source} ${Status}\n' | grep samba:
libsmbclient 2:3.4.6~dfsg-1ubuntu1 samba install ok installed
libsmbclient-dev 2:3.4.6~dfsg-1ubuntu1 samba install ok installed
libwbclient0 2:3.4.6~dfsg-1ubuntu1 samba install ok installed
samba-common 2:3.4.6~dfsg-1ubuntu1 samba install ok installed
samba-common-bin 2:3.4.6~dfsg-1ubuntu1 samba install ok installed
smbclient 2:3.4.6~dfsg-1ubuntu1 samba install ok installed