I continually get Mac error # 9999 when I try to burn a concert off youtube. They are MP4 files. It usually waits till about a minute before completion before displaying the error. I have contacted Corel and a specialist had me delete certain hidden and unhidden files. That worked for a DVD or 2 then the error reappeared. We then triled new administrators.. That worked for burning 4 perfect videos before crashing again. Corel seems to refuse to screen share of talk to you live on the phone. SO the Emails keep flying back and forth. After a $100. purchase I am quite frustrated with the lack of a simple phone conversation which may be all that is necessary to solve the problem. Any suggestions? Tom