you've got a version mismatch. you need to recompile your module(s).
I thought i had, by running make from within the build-2.6 directory. Where do i need to run modprobe from to load the right version of the modules? I had assumed it was from the build-2.6 directory since insmod.sh is there too, but knowing me i've probably got it all wrong.
in /usr/src/linux or wherever you do make modules then make install-modules then depmod the modules in use are in /lib/modules/`uname -r`/ make install-modules copies them across to the right place. Dick