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Fails for me too (Win2k, python debug build). But it is a 
marshal issue!
Here's a script to reproduce it when running with a debug 
build:
  import marshal; marshal.dumps([128] * 1000)
(anything between 128 and 255 will trigger the error, and the 
list must be large enough.

The debugger shows that w_long is called with x = 128, and 
than w_more() is called with c = 128, and the 
Py_SAFEDOWNCAST macro fails, maybe because char is 
signed on this platform.