I just installed Stamp and found the same problem. It's only with my .wav files. There is no standard tagging for wave files apparently. But, the tag editor in both Windows Media Player 11 and dbPowerAmp tag them as you are describing. The only fix I have found is to swap entries when writing the tags. Stamp reads and writes mp3 tags correctly but not wave tags. Just thought I'd let you know you're not alone with this problem. Would be nice to get it fixed.