Are you sure modprobe is actually loading the version you've built? I bet you still have the previous version installed in the kernel module tree. Verbose switch for modprobe should tell you that.
It should be possible to insmod the module you built. If that works, remove the module from /lib/modules/..., copy your rebuilt version over, and run depmod -a to regenerate dependency info - that should heal modprobe.
The longer way for fixing dkms should be:
Code:
export EVDI="evdi/1.0.335"
dkms remove $EVDI --all
dkms add $EVDI
dkmd build $EVDI
dkms install $EVDI
Cheers,
Michal