I’ve developed a MaxMSP Csound external called dmp.csound~ (to avoid
confusion with other versions), for WindowsXP and MacOSX.  I should mention
that I haven’t fully tested the windows version (just ported it yesterday).  
You can download it at:

http://www.davixology.com/csound~.html

Installation instructions and a demo patch are included in the downloads.
If you find a bug, please email me with some details about what you were
doing when the crash occurred.  Even more helpful would be a patch and
your csd or orc/sco files.  

BTW, the windows version uses a 64bit version of Csound (sorry, it’s the only
one installed with the standard Csound5 installer), so its performance
may not be acceptable if you have a slow computer.  

Anyways, have fun!

Davis