I have a large number of Flac files that I created with dBpoweramp from CDs. When I select some of these files to convert to AAC, using the Nero AAC codec in the latest version of dBpoweramp batch converter, the Album Artist string is duplicated and delimited by a semicolon. i.e. "Beck" is displayed as "Beck; Beck". If I proceed with the conversion the tag is written to the AAC file as "Beck; Beck".

I have checked the Album Artist tags in the Flac files using latest versions of both Foobar 2000 and Tag & Rename and they are not apear to be duplicated. Any ideas as to what is going on? I'm running Windows 7 x64.