Can't mount CIFS drive

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http://askubuntu.com – I have a number of fstab entries that will no longer mount. They used to work under 10.04 and after I did a clean install of 12.04, they did work for a while although they would periodically hang up and become unresponsive until they were unmounted "lazily" and then remounted. Now, I can't mount them at all. The shares all mount fine in nautilus. When trying to mount commandline: sudo mount -t cifs //target/share /shares/mount_point -o user=username,password=password nothing happens. It just sits there; no error, no messages in the logs, no timeout(!) so far as I have left it trying (minute (HowTos)