No, i have 3 different Vue versions running on my Mac at the moment. Without any problem. What i have realised is, that sometimes Vue can have difficulties with other applications running the same time. I have more problems when i do some very old games that run under classic. Or have Yahoo messenger open the same time. This can cause problems but never as much that Vue does not start. Only a crash could happen. Probably memory conflicts.

One day your ship comes in - but you're at the airport.