Yesterday I talked about this new app I downloaded [fluid.app], since I downloading and running it I've had some problems, serious ones. Of course this particular laptop is very long in the tooth, and at the wrong end of the power scale. I also set-up at 5 apps to run using it, so maybe that was too much a drain on my humble system. The problems I had were, applications hanging to the point where apple+option+esc, was no good and I had to apple+control+restart. The 1st time I did this, I then got the flashing question mark on my start up disk! After a bit of prodding and poking I managed to get things back up and running. Then today the same thing happened, with all 5 apps running again, so I have now stopped using the app, and the apps it creates until I can investigate further.
Pity it is a great idea.
Edit, it seems that it is an OS issue, and may even work well on Intel machines