[Twisted-Python] a weird problem about IOCP reactor and perspective broker

Hi all I attach two files for this problem. When i used iocp reactor with pb, I noticed once the remote method returned a deferred object, the client app would raise many exceptions..kinda weird. It is ok to return the value directly (no defer) The most interested part is when I used select reactor, everything was fine..I am not sure whether it is a bug on IOCP. OS: windows 7 64 bit py: 2.6.6 32bit twisted version: 12.0.0 Regards gelin yan