Lets see if i can help you. The adjustments to the key frame that were referred to in an earlier post take place in the viewer window. That would be the first video window. At the top of the viewer window you should see the tabs “Video”, “Stereo”,”Filters” and “Motion”. Click on “Motion”and check out the box to the right of “Scale” to see at what scale the photo or video begins. This is where you set your first key frame(the beginning point of the pan, zoom, etc…you want a whole number here. Sometimes without knowing it you will start the movement at for example..25.32. Round that number up or down to a whole number by clicking on the scale arrow. This has worked for me when I changed the beginning key frame..others have said they must round up or down the end point as well. Try this and then let me know if you have success…or other questions.
Best of luck
cg