I’ve been really enjoying VirtualBox for a few months now.  Today, when I tried to open my images, I got a really scary error.  I thought that all of my work was gone.  I tried to open the other images I had, all of them failed with the same error.

VERR_SUPLIB_WORLD_WRITABLE

I’m using OSX, I did a fair bit of googling, the solution that worked for me:

chmod o-w /Applications