Do you use 5.1 channel sound?
Can you test this sample file with mediaportal.
1. does it play corrrect (front left, front right, center, back left, back right, sub)
2. progress bar correct?
Do you have another player for .wv?
3. does it play correct?
4. progress bar?
SourceForge.net: MediaInfo: Files
Helios
Are you using the latest mediainfo.dll from the above page, scroll down to bottom of page and just select your OS zip file and extract to the plugins\windows folder.
Must admit not seen this with any of my music files, wondering if there is a corruption in the tag details that are not being read correctly by MP, but foobar may be a bit more relaxed on this kind of issue, so seems fine there.
Regards