I uninstalled, and reinstalled it outside the program files directory (I recommend this on vista).
So here is my VR920 bug report:
As other people have said, on a VR920 the left screen shows the screen (or window contents) squashed and duplicated, so that you see the same image on the top and bottom of the screen. I think the top and bottom of the screen are identical, but it is hard to tell. It displays this perfectly, without any tearing.
On the right screen however, it shows the image unsquashed, taking up the whole screen. The right eye image appears to be the correct image for the right eye and it correctly takes up the whole screen. BUT, when running Portal fullscreen, the right screen has horrible tearing. The correct image is shown below the tear, but above the tear the left-eye image is still shown. The tear-line bobs up and down, but mostly it is about 2 thirds of the way down the screen. Vsync was turned on, and the other screen on that adapter was disabled. I've seen this kind of tearing before, but normally it is in the top 10% of the screen, not 2/3rds of the way down the screen.
The windowed mode Dynamic Test program does the same thing, but without any tearing. The window contents are squashed and duplicated on the left eye, and perfectly correct on the right eye.
By the way, all the 2D logo screens at the start of Portal work properly.
Another important bug is that you are not setting the VR920 to stereoscopic mode at the start, so the user must always turn it on manually on the glasses.
You are correctly turning off stereoscopic mode when you close, BUT randomly sometimes the function will fail and the glasses will stay in stereoscopic mode. That is Vuzix's fault, not yours, but you should still fix the problem by turning off stereoscopic mode, then sleeping for a few hundred milliseconds, then turning off stereoscopic mode a second time.
There is also a problem with enabled-by-hotkey not working. It stays enabled the whole time, regardless of whether you press the hotkey or not.
Bugs:
1. Left screen is squashed and duplicated
2. Tearing on right screen
3. VR920 not put in Stereoscopic mode
4. Stereoscopic mode should be turned off twice with a delay in between instead of once
5. Enabled by hotkey is always in stereo with the bugs above, even when stereo should be off
I can also confirm the "Error named pipe" error mentioned above. "pipe" is a strange name for an error.
As it is now, VR920 support is completely unusable. If you can fix the squashed left screen bug then it will be almost usable (but only the bottom 3rd of the screen would be stereo for me in some games).
Let me know if you want me to help fix these bugs.