This has probably remembered it's position after being moved off screen...
To fix this, open the registry editor (Start->Run.. REGEDIT) and locate the
following folder
HKEY_CURRENT_USER/Software/Autodesk/AutoCAD/R15.0/ACAD-12:409/Profiles/Archi
tectural Desktop/Dialogs/Common-AddObjDialog
Delete this folder, and your dialogs should return back to their default
position next time you run an add command.
Which version and service pack are you using. Rollup moving the dialog off
screen was fully fixed in SP3 of ADTr3.
--
mark webb
software engineer
building industry division, autodesk inc
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