I'm new here. I've been getting System Overload prompts, and can't work on one of my songs now. I have a late 2009 iMac, 10.10,5 Yosemite, 16GB memory, non-firewire. I use Logic X, and unless there's been an update this week, use the current version. This same song worked yesterday, so it's confusing why it won't work today. I don't think there's any more CPU usage than on any of my other tracks that work fine. I use no software instruments, other than two Shaker tracks. I use an UAD Apollo. I store my Logic X projects on a Glyph drive. My hard drive is nearly maxed out now. This is maddening. Please help if you can, thanks.