[winGRASS] Error Adding Layer to Display

[Stephen Sloan]

I'm getting the following error when I try to add a vector layer to my display:

invalid command name ".mainframe.frame.pw1.f0.frame.pgs.fpage_3.sw.tree_3"
invalid command name ".mainframe.frame.pw1.f0.frame.pgs.fpage_3.sw.tree_3"
    while executing
"$tree($mon) selection get"
    (procedure "GmTree::add" line 11)
    invoked from within
"GmTree::add vector"
    ("uplevel" body line 1)
    invoked from within
"uplevel \#0 $cmd"
    (procedure "Button::_release" line 18)
    invoked from within
"Button::_release .mainframe.topf.tb0.bbox2.b0"
    (command bound to event)

I'm using the sample data (spearfish60).

Any ideas? I've used the same data with success on my Linux GRASS setup.
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