If you’re wondering why we released a service pack instead of another hot fix, here’s an explanation from Luc-Eric, our sw dev mgr:

The thinking is that the scene corruption hot fixes are important enough that you should delete other version of 2012 Softimage 2011 and just have this one. With a service pack versioned, you can tell that you have the fixes installed, otherwise there is no telling if you are you using “the good” or “the bad” version of 2012 2011, because we’re just distributing hotfixes as zip with loose DLLs and you can’t tell if you’ve installed it correctly. Hotfixes are normally for things that are important, but not absolutely essential. I think this one is critical.

edit: fixed typo in version number