Xilisoft problems

Hello, I am new to this forum and hope I am posting this in the correct area. I have been using xilisoft dvd creator on my windows computer for years and just purchased it for my new macbook pro. I used it a few times to convert avi files to dvd’s to play them in a dvd player and it worked, but for some reason it stopped working. I’m not sure if this is because I upgraded to Lion, but it goes through the process then when it gets to the part where it is supposed to burn the dvd, it stops and I get the error message that it quit unexpectedly. Any ideas? Thanks