I tried to run several sessions, to spam hook (with lua), no crash. And it is very small update, no big change, only change affect all version (and problem seem only on Vanilla for few users).
Can you try with new update
I cannot reproduce problem, I recompiled files, if you can update WRobot and check if Windows is updated and try to install https://storage.googleapis.com/google-code-archive-downloads/v2/code.google.com/slimdx/SlimDX Runtime .NET 4.0 x86 (January 2012).msi (try also to disable your antivirus when you install WRobot)
Can you try without fightclass, and can you send me (by private message) few recent crash rapports files please (in folder "World of Warcraft\Errors\", only .txt files)