I listen to the Concert Vault at home and at work. I have been experiencing the same problems on work pc's, as well as my home desktop pc and laptop. The stream just stops playing. I first noticed it at work, and I thought it might be firewall related, but then the same problem happened at home. The time counter goes to 00:00. I pause and then play and it may pick up. Sometimes it continues for a little while, other times it plays for a few seconds and I may receive a 'Failure Stream Dropped' message. I have also experienced 'Network Connection Timed Out' messages. Other times, I will do nothing and the stream picks up on its own. I am currently listening at work and it has been doing this all day long. Not just a specific concert. Occasionally, when starting a stream, I may see a 'Tunneling Port nnn' message, always at work, and I know the streamn won't play when this occurs. Often, I will clear temp files/cookies, log off andd back on, which seems to temporarily clean up the issue.
This is an awesome web site. I love being able to listen to artists at different stages of their career. I also enjoy hearing shows that I may have attended. Hopefully, the site just gets better and better.