@User: I still don't know why, but clearly magic's handling of the overloaded "grid" command is failing to disambiguate between the Tcl and magic versions of the command. I think the easiest way to fix the problem would be to add the "::" in front of "grid" in tcltk/toolkit.tcl (lines 250 and 272). That would force Tcl to assume the Tk version of "grid".