Unfortunately, I’d need to examine the individual files. There are multiple problems that can cause hangups, not just this. This one was probably the height of the engraves - they were the full twelve inches on the bed and we can’t engrave or cut over about eleven inches right now. And the fact that they were an engrave, not a cut, would make the engrave run over the time limit - the limiting factor is the time to travel back and forth the full height of the bed.
Don’t get too freaked out about it…you can probably get those engrave files to load even if they have double lines, if you just rotate them in the file before you try to load it to the interface. So you won’t lose your work.
But it’s a bad way to design cuts. It’s going to take a long time to process and load. So if you want to improve the process and make your designing go a lot more smoothly on future cuts, just read the tutorial, understand the difference between what gets engraved and what gets cut, and design future files with vector paths and stroke colors instead of fills. (The Live Trace function is notorious for doing that - if you used that on a certain kind of image, you should go in and delete the duplicate lines.)
You’ve probably been struggling through much longer processing times than you need to. It’s really quick with Strokes instead of fills.