OK, I think I found the porblem.
I was trying to burn 3 files, each about 50 minutes long. When I went through this again and waited about 5 minutes during "Calculate Duration" it finally gave a message that the files were too large.
I eventually reduced the queue to 1 file and it worked.
I tried a different software package "MP3 to CD Converter Professional" and it was able to copy 2 of the 3 files onto 1 CD so it must do some compression on the way through.
One of the problems with .cda files is that they all have a size of 1 KB when they are finished so it is difficult to see how the CD is loaded.
Mike Smith