That little button have tripped me up a few times too, especially if the effect I'm playing with only applied to the 'before' side of the screen, and I couldn't figure out why it was not being displayed.
Instant facepalm every time I do it :)

Yep, that took care of it. Thanks, don't know how I changed that but must have by accident. Another question, is there a way to simulate a rack focus in Vegas?

Not easily with just bare Vegas, but NewBlue have a fake rack focus effect in their new Video Essentials II plugin package. How convincingly it works will probably depend to a large extent on the characteristics of the material you want to use it on, but it might be worth a look. There's a trial version for download so you can see how well it will work for you before you have to part with any cash.

Mark

Yea, I am on their email list.
Thanks

From the image that shows the settings dials on the NewBlue FX web site, the rack focus filter looks rather primitive. That is, you can have a band of in-focus footage at some abritrary angle and position. Note that you can quite easily accomplish the same within Vegas by creating a gradient that is black-white-black (or the inverse depending on how you apply it). You can then use the gradient as a mask over the in-focus track that will only allow a band of in-focus footage to appear. In the background on a seperate track you would have out-of-focus footage of the same scene. You can animate the position of the gradient mask to make the point of focus move. For more complex effects of this type, Boris Red does a great job with its Z-blur filter.