[IPython-user] incremental search backward not working on win32

[Reckoner]

on win32, I have downloaded the latest versions of pyreadline and
ipython, but Ctrl-R doesn't perform incremental search backward as
usual.

For example:


In [8]: <Ctrl-R>
run

produces only the last "run" and does not incrementally complete
through the history even though there are multiple "run" commands
find-able using the "up" arrow key.

I am using the  default Windows console (i.e. cmd window) and not some
other kind of console program.

Thanks in advance.