nVidia Optimus / Bumblebee not working; Unknown header type 7f

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http://www.linuxquestions.org – I had this working last month, but I just did a fresh install of Slackware64-14.0 so I had to reinstall it again. In that time, I see both the software and the Optimus wiki page for Slackware has been updated, and after following the instructions to the letter, it's not working. I have a multilib enabled system, so I was very careful to use COMPAT32=yes on all the packages that were noted for it. Everything compiled and installed find, with no errors or anything. After starting bumblebeed and running optirun glxspheres, it always uses the Intel graphics instead. I thought that perhaps som (HowTos)