Some of the earlier Vitus Carbone frames suffered from joint failure (that sounds like a Cheech & Chong joke...). I've seen a couple that had separated at the seat tube/BB joint, but that was 20 years ago. They were glued back together with a special epoxy. I seem to recall that a couple places were authorized Vitus repair centers- Harry Havnoonian was one and they say they repair bonded frames: http://www.hhracinggroup.com/page2.html