mineralinsulated

hi i'm using a registered version of switch for mac v1.50 power pc. I have some files in the flac format that have all the meta data i require, artist, album, track number etc. My problem is that when i convert these files to mp3, all the meta data is lost! What am i doing wrong?? I paid over $50 for this program and wouldn't have thought transfering the meta data should be a problem. Please, any help appreciated.