I Have notice that if you have a large number of masking keyframes on a clip, ie one per frame, that Vegas 5b will crash after a number of modifications to masking points or the keyframes. If you do a small of changes and save the veg and restart vegas, no problem. I have noticed this problem since Aug but just worked around it. I have assume it is an issue the memory resources. Now with more overhead with HDV, I have some concerns about the keying issue. I realize that probably most users do not work frame by frame with masking and effects, but if you do, backup often.