nvidia module won't load

When I booted my machine this morning GDM wouldn't start. I found out that X.org
wouldn't start because the module "nvidia" wasn't loaded. I tried to load it
manully with modprobe:
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je@rivendell:~$ sudo modprobe nvidia
FATAL: Error inserting nvidia
(/lib/modules/2.6.10-4-686/kernel/drivers/video/nvidia.ko): Invalid module format
-------------------------------------

In dmesg I find the following:
nvidia: disagrees about version of symbol struct_module

I can force the module to be insterted and everything works like before, but I
souldn't be like that:
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je@rivendell:~$ sudo modprobe -f nvidia
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I think this happend after an update yesterday (11 march 2005) where I remember
that I updated my kernel (linux-image) and restricted modules.