I think most everyone is aware of this, but maybe some newbies have not heard:
The Vue 6i minimum memory requirement is not 1GB memory.
It's "1GB of free memory". That is, 1GB left free after your operating system plus everything else that loads at operating system startup (don't know how that works on a Mac). Some people have a lot of programs and utilities constantly running and using memory, many of which load themselves automatically when they start their systems.

Again, something about different people's systems that can cause Vue faults for some people and not for others.

Now, before i get labeled as an e-on apologist, i am not saying that the particular problems reported here are because of this - i doubt they are - but if you have 1GB total memory, it's something you should be aware of, because one can certainly have more than one problem and from more than one cause.