So I did a bunch of masking/rotoscoping with the media generator to make a lightsaber effect shot on canon hv30 24p mode hdv. I then imported it into vegas and did all my masking but had the project properties set to 720x480. I want to change it to 1280x720 to encode to HD but whenever i do that, the masking shifts and doesnt match up with what i did originally. Anyone know how to swtich the aspect ratio and maintain the origianl masking position? thanks