I don't know if this should be reported here but after spending some time trying to solve the problem I decided it's probably worth mentioning here in case anybody else can help.
When I open a folder containing an mp3 album, I have noticed that when I drag and drop the files that they are re arranged by CDBurnerXP. They don't seem to be re-ordered in any particular way, for example, they are not re-listed in CDBurnerXP
's files window alphabetically.
I checked that each file begins with "01" followed by the track title.
I checked in a tag edittor that the files contain the correct