Problem using Thunar with smbfs

[Bob Snyder]

I am trying to use Thunar to move/delete files that have been mounted 
with smbfs (I'm using slackware 10.2, Xfce 4.2.2, Thunar 0.3.0 beta1).   
The file's context box has the cut, delete, and rename selections grayed 
out as if I don't have write permission. However, I am able to do these 
same operations from a shell as the same ordinary user. Also, from the 
Properties->Permissions tab, the 'Group' button is blank, and pushing it 
does not drop down a list of groups. I would have read/write permissions 
through the group affiliation.

I have played with the uid and gid options to smbmount with no effect.

Thanks,

Bob S.