>I have gotten this message before "CANNOT ACCESS SELECTED TABLE" and unfortunately, it doesn't generate an error so it's hard to debug. But I now get it during the interactive change of listbox1:
>If thisform.mylistbox1.selected(1)=.t.
>select * from office2 into cursor whichoff
>endi
>If thisform.mylistbox1.selected(2)=.t.
>select * from office1 into cursor whichoff
>endi
>If thisform.mylistbox1.selected(3)=.t.
>select * from office0 into cursor whichoff
>endi
>If thisform.mylistbox1.selected(4)=.t.
>select * from office9 into cursor whichoff
>endi
>
>thisform.mylistbox4.rowsource='whichoff'

Tim,
Change your myListbox.Rowsourcetype to SQL and define SQL in its rowsource.

*myListbox4.init
with this
 .Rowsourcetype = 4
 .Rowsource = 'select * from '+;
  '(crsOffices.Office) into cursor whichoff'
endwith

*myListbox1.init
with this
 .Rowsourcetype = 4
 .Rowsource = 'select ...,OfficeCursorName as Office from '+;
  '... into cursor crsOffices'
endwith
*Valid
with thisform.myListbox4
 .requery
 .listndex=0
endwith

Cetin