I've got the exact same problem:
Trying to open the Pixel Bender Toolkit, it immediately closes after initiation. No message whatsoever.
I hadn't used the plug-in for a while, I have changed my graphic card to an unsupported NVidia card. But the Pixel Bender filters do open in Photoshop CS5(12.0 64-bit), although new filter don't seem to show up (but that might be a different issue)