It could well be the moun tasks don't give many problems. I don't get many of them, and I don't think most of them are that long either.
But when I leave the applications in memory, doesn't that use memory that otherwise could be used for crunching? I crunch at least 6 other projects on that computer (dependent of how much work the others have), and when they all stay in memory, it's going to add up I suppose. I don't know much about computers, so when I'm wrong about that, please tell me.
And will there ever be checkpoints in the evolution tasks, so this problem will be dealt with, or it it just not possible?