How to make 18.x more stable?

I'll see if I have time to make something up. I'm sure that if you have a project with LL regions, export everything to an upperlevel project. The upper level will have LL regions of it's own that may or may not conflict. Import everything, then set the partitions to anything, you will get a crash. The only way I have been able to get this process to work is to make sure that no LL regions overlap, set the LLregions to floating(even though they don't overlap, it will crash if they are locked), set the partitions to source(It will crash if anything else is set the first time. After you get a successful compile, then this can be changed). Then export and import to the 3rd(then 4th) level project.

The crashes will get worse as you get more and more levels. I am around 3-4 levels of importing partions at the moment, with 100% crashes on this last level. I got lucky on the lower level to get this far. I needed to go back to a successfully compiled level to move the LL regions, and now I can't get it to compile at all. Even Quartus will crash sometimes now. Many times before, just the process would crash, but quartus would be OK.(I restarted anyway)

If you really want to have fun, import one lower level partition into several instances in an upper level. It reeeaallly likes that one.

My computer is a W7 machine 6/12 core @ 4.5GHz and 64GB of RAM. This has all worked just fine in quartus 13.1. I never had any issues other than making the program work. 13.1 never crashed. I'm just trying to upgrade an old STIII design to Aria10, then to ST10. The code works, Quartus doesn't!