Hi Jonas,
Thanks for the link; looks like you were having exactly the same issue as me. I followed another link from your post and read down to this line from the forum admin:
Recently, with the help of some of you, we were able to identify an issue reading the audio stream from the Samsung HMX-H100 camcorder in Vegas Movie Studio HD Platinum 10
It’s odd that it only happened during an ‘upgrade’ to 9.0e, but I guess I’ll downgrade until they’re able to patch this problem, or transcode..
Thanks again
Andrew