These are issues affecting our Syphon implementations. If you are a developer experiencing issues with the framework, please check http://forums.v002.info/topic.php?id=8
Having more than one client or more than one server (but you can have one of each at the same time) inside Resolume Avenue will likely cause a crash when you close one of the instances.
Sometimes if a client hangs it will cause the app hosting the server to stutter.