I too have had this problem - Sometimes changing smoothness to 0 doesn't work, so I have added interim keyframes (sometimes needing as much as one every 10 or so frames) and making sure the border I want stays where I put it.

Have you tried making sure that 'x centre' under 'rotation' is a constant value?
i.e. if your first keyframe has an x centre of 320, then your last or all intervening keyframes have that same value?

Thanks for the suggestions:
I changed the keyframes to "smooth" and it didn't help at all. Next I tried setting the keyframe smoothness to 0.000: Vegas keeps changing it back to 1.000. I'll look at the "X center" value, but I'm often trying to zoom and pan diagonally, so shouldn't I expect the X value to change? The real problem is that I'm typically zooming toward the edge of the image and as it zooms, the black border wobbles in and out of view. I must be doing something wrong!
wikksmith

> I tried setting the keyframe smoothness to 0.000: Vegas keeps changing it back to 1.000.

I think my UnSmooth Keyframes script will help you out. It will unsmooth all keyframes for the selected events. (i.e., set smoothness to zero)

When you are doing this manually, you have to select each individual keyframe and change its smoothness one at a time. Sometimes you have to zoom in on the keyframe timeline to see them all because they will appear on top of each other if they are too close. Just use the script and you should be fine.

~jr

That is one of my Vegas 7 wishes to have some menu pop up after clicking the keyframe saying there are 22 keyffames behind this frame and they are as follows in a descending picture diagram so you can have the choice of deleting all of them or one of them.

JJK

can you try entering the same x centre and y centre (UNDER 'ROTATION' NOT 'POSITION') values for your first and last keyframe and see if that helps. It certainly does the trick for me. x & y rotation centre does not actually move the frame, but seems to do the voodoo. remember it's the ones under ROTATION!!!