I'm having a real problem with all dvd burning software. Roxio is just the latest I've tried. Every file I import expands to about 7 or 8 times the size of the original. For example, a 462 MB file becomes 3.51 GB. I'm using mp4s and avi files. Is this a Mavericks thing? Apple tech support is no help on the issue as they no longer want to deal with dvd burning. Has anyone else had this problem?