On Win 98, specifying pos as a tuple instead of a list in the constuctor for curve or convex produces an error message.
TypeError: pos must be an (N x 3) array
However, on Win2000, this produces a crash:
Program Error. pythonw.exe has generated errors and will be closed by Windows. The error log says Exception number c0000005 (access violation).
(I don't know what an access violation is, but this happens even if one logs on as administrator.)