Okay, I first downloaded the new ffdshow linked on the green button post above. Tried with the previous version, didn't work. Downloaded the new one from the website, reregistered the *.ax file, copied to the system32 directory, registered it, also didn't work. Same error:
Without ffdshow, no compression, no crash, but no recording either.
Edit: BTW, I tried saving on C:, with a directory with no blank spaces in it, same thing.