Congratulations, on your first post you already discovered a major bug in the latest LameXP version...
I can confirm your issue, WMA v2 sources are rejected by the current LameXP version. I went back to the previous stable version 4.15, and this version has no problems with these sources.
Time for a hotfix...
Cheers
manolito
And a general rant:
After going back to a previous stable version I noticed that even for stable versions there is a time bomb of 1 year. I think that this is plain stupid. For Alpha, Beta or RC versions I can understand, but not for stable versions. Users may have valid reasons to stick to older stable versions, this latest WMA bug is a good example. Please stop imposing your views on users...